21153308 has 24 divisors (see below), whose sum is σ = 42510720. Its totient is φ = 9108720.

The previous prime is 21153299. The next prime is 21153323. The reversal of 21153308 is 80335112.

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, 11816 + ... + 13487.

It is an arithmetic number, because the mean of its divisors is an integer number (1771280).

Almost surely, 2^21153308 is an apocalyptic number.

It is an amenable number.

21153308 is an abundant number, since it is smaller than the sum of its proper divisors (21357412).

21153308 is a wasteful number, since it uses less digits than its factorization.

21153308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25337 (or 25335 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 21153308 is about 4599.2725511759. The cubic root of 21153308 is about 276.5621637222.

The spelling of 21153308 in words is "twenty-one million, one hundred fifty-three thousand, three hundred eight".