21310608 has 40 divisors (see below), whose sum is σ = 60058656. Its totient is φ = 6457600.

The previous prime is 21310607. The next prime is 21310613. The reversal of 21310608 is 80601312.

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21310603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19653 + ... + 20708.

Almost surely, 2^21310608 is an apocalyptic number.

It is an amenable number.

21310608 is an abundant number, since it is smaller than the sum of its proper divisors (38748048).

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

21310608 is a wasteful number, since it uses less digits than its factorization.

21310608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40383 (or 40377 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 21310608 is about 4616.3414085182. The cubic root of 21310608 is about 277.2459943378.

The spelling of 21310608 in words is "twenty-one million, three hundred ten thousand, six hundred eight".