21268160 has 28 divisors (see below), whose sum is σ = 50645568. Its totient is φ = 8507136.

The previous prime is 21268157. The next prime is 21268171. The reversal of 21268160 is 6186212.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32912 + ... + 33551.

Almost surely, 2^21268160 is an apocalyptic number.

21268160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21268160 is an abundant number, since it is smaller than the sum of its proper divisors (29377408).

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

21268160 is an equidigital number, since it uses as much as digits as its factorization.

21268160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66480 (or 66470 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 21268160 is about 4611.7415365564. The cubic root of 21268160 is about 277.0617924850.

The spelling of 21268160 in words is "twenty-one million, two hundred sixty-eight thousand, one hundred sixty".