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BaseRepresentation
bin101000001000…
…1110001100000
31110121011101021
41100101301200
520341404240
62031015224
7343605463
oct120216140
943534337
1021044320
1110973a00
12706a514
13448a87b
142b1b2da
151caa54a
hex1411c60

21044320 has 72 divisors (see below), whose sum is σ = 54698112. Its totient is φ = 7645440.

The previous prime is 21044311. The next prime is 21044341. The reversal of 21044320 is 2344012.

Adding to 21044320 its reverse (2344012), we get a palindrome (23388332).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 21044294 and 21044303.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18817 + ... + 19903.

It is an arithmetic number, because the mean of its divisors is an integer number (759696).

Almost surely, 221044320 is an apocalyptic number.

21044320 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 21044320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27349056).

21044320 is an abundant number, since it is smaller than the sum of its proper divisors (33653792).

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

21044320 is a wasteful number, since it uses less digits than its factorization.

21044320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1124 (or 1105 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 21044320 is about 4587.4088546804. The cubic root of 21044320 is about 276.0863693847.

The spelling of 21044320 in words is "twenty-one million, forty-four thousand, three hundred twenty".