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21030000 = 24354701
BaseRepresentation
bin101000000111…
…0010001110000
31110120102201220
41100032101300
520340430000
62030425040
7343515645
oct120162160
943512656
1021030000
1110964172
127062180
1344841b4
142b15dcc
151ca61a0
hex140e470

21030000 has 100 divisors (see below), whose sum is σ = 67984488. Its totient is φ = 5600000.

The previous prime is 21029977. The next prime is 21030001. The reversal of 21030000 is 3012.

It is a tau number, because it is divible by the number of its divisors (100).

It is a Harshad number since it is a multiple of its sum of digits (6).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21030001) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 29650 + ... + 30350.

Almost surely, 221030000 is an apocalyptic number.

21030000 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 21030000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33992244).

21030000 is an abundant number, since it is smaller than the sum of its proper divisors (46954488).

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

21030000 is an equidigital number, since it uses as much as digits as its factorization.

21030000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 732 (or 711 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 6.

The square root of 21030000 is about 4585.8477951192. The cubic root of 21030000 is about 276.0237324688.

Adding to 21030000 its reverse (3012), we get a palindrome (21033012).

The spelling of 21030000 in words is "twenty-one million, thirty thousand".

Divisors: 1 2 3 4 5 6 8 10 12 15 16 20 24 25 30 40 48 50 60 75 80 100 120 125 150 200 240 250 300 375 400 500 600 625 701 750 1000 1200 1250 1402 1500 1875 2000 2103 2500 2804 3000 3505 3750 4206 5000 5608 6000 7010 7500 8412 10000 10515 11216 14020 15000 16824 17525 21030 28040 30000 33648 35050 42060 52575 56080 70100 84120 87625 105150 140200 168240 175250 210300 262875 280400 350500 420600 438125 525750 701000 841200 876250 1051500 1314375 1402000 1752500 2103000 2628750 3505000 4206000 5257500 7010000 10515000 21030000