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21423000 = 2335337193
BaseRepresentation
bin101000110111…
…0001110011000
31111022101211110
41101232032120
520441014000
62043100320
7350043504
oct121561630
944271743
1021423000
1111102465
1272116a0
134591041
142bb9304
151d32850
hex146e398

21423000 has 128 divisors (see below), whose sum is σ = 69001920. Its totient is φ = 5529600.

The previous prime is 21422993. The next prime is 21423007. The reversal of 21423000 is 32412.

It is an interprime number because it is at equal distance from previous prime (21422993) and next prime (21423007).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21423007) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 110904 + ... + 111096.

Almost surely, 221423000 is an apocalyptic number.

21423000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21423000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34500960).

21423000 is an abundant number, since it is smaller than the sum of its proper divisors (47578920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21423000 is a wasteful number, since it uses less digits than its factorization.

21423000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254 (or 240 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 21423000 is about 4628.4986766769. The cubic root of 21423000 is about 277.7325378176.

Adding to 21423000 its reverse (32412), we get a palindrome (21455412).

The spelling of 21423000 in words is "twenty-one million, four hundred twenty-three thousand".

Divisors: 1 2 3 4 5 6 8 10 12 15 20 24 25 30 37 40 50 60 74 75 100 111 120 125 148 150 185 193 200 222 250 296 300 370 375 386 444 500 555 579 600 740 750 772 888 925 965 1000 1110 1158 1480 1500 1544 1850 1930 2220 2316 2775 2895 3000 3700 3860 4440 4625 4632 4825 5550 5790 7141 7400 7720 9250 9650 11100 11580 13875 14282 14475 18500 19300 21423 22200 23160 24125 27750 28564 28950 35705 37000 38600 42846 48250 55500 57128 57900 71410 72375 85692 96500 107115 111000 115800 142820 144750 171384 178525 193000 214230 285640 289500 357050 428460 535575 579000 714100 856920 892625 1071150 1428200 1785250 2142300 2677875 3570500 4284600 5355750 7141000 10711500 21423000