21274508 has 24 divisors (see below), whose sum is σ = 38364480. Its totient is φ = 10316880.

The previous prime is 21274507. The next prime is 21274529. The reversal of 21274508 is 80547212.

It is not an unprimeable number, because it can be changed into a prime (21274507) 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, 30443 + ... + 31133.

It is an arithmetic number, because the mean of its divisors is an integer number (1598520).

Almost surely, 2^21274508 is an apocalyptic number.

It is an amenable number.

21274508 is a deficient number, since it is larger than the sum of its proper divisors (17089972).

21274508 is a wasteful number, since it uses less digits than its factorization.

21274508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 917 (or 915 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 21274508 is about 4612.4297284620. The cubic root of 21274508 is about 277.0893550214.

The spelling of 21274508 in words is "twenty-one million, two hundred seventy-four thousand, five hundred eight".