21310268 has 24 divisors (see below), whose sum is σ = 43997184. Its totient is φ = 8838000.

The previous prime is 21310253. The next prime is 21310271. The reversal of 21310268 is 86201312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11408 + ... + 13143.

It is an arithmetic number, because the mean of its divisors is an integer number (1833216).

Almost surely, 2^21310268 is an apocalyptic number.

21310268 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21310268 is an abundant number, since it is smaller than the sum of its proper divisors (22686916).

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

21310268 is a wasteful number, since it uses less digits than its factorization.

21310268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24593 (or 24591 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 21310268 is about 4616.3045826722. The cubic root of 21310268 is about 277.2445198900.

The spelling of 21310268 in words is "twenty-one million, three hundred ten thousand, two hundred sixty-eight".