21100608 has 56 divisors (see below), whose sum is σ = 62036960. Its totient is φ = 7032960.

The previous prime is 21100601. The next prime is 21100613. The reversal of 21100608 is 80600112.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21100601) 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, 4378 + ... + 7833.

Almost surely, 2^21100608 is an apocalyptic number.

It is an amenable number.

21100608 is an abundant number, since it is smaller than the sum of its proper divisors (40936352).

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

21100608 is a wasteful number, since it uses less digits than its factorization.

21100608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12232 (or 12216 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 21100608 is about 4593.5398115179. The cubic root of 21100608 is about 276.3323029615.

The spelling of 21100608 in words is "twenty-one million, one hundred thousand, six hundred eight".