21274316 has 12 divisors (see below), whose sum is σ = 42548688. Its totient is φ = 9117552.

The previous prime is 21274307. The next prime is 21274343. The reversal of 21274316 is 61347212.

21274316 is an admirable number.

It is a super-4 number, since 4×21274316⁴ (a number of 30 digits) contains 4444 as substring.

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, 379871 + ... + 379926.

It is an arithmetic number, because the mean of its divisors is an integer number (3545724).

Almost surely, 2^21274316 is an apocalyptic number.

It is an amenable number.

21274316 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21274316 is a wasteful number, since it uses less digits than its factorization.

21274316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 759808 (or 759806 counting only the distinct ones).

The product of its digits is 2016, while the sum is 26.

The square root of 21274316 is about 4612.4089150898. The cubic root of 21274316 is about 277.0885214523.

The spelling of 21274316 in words is "twenty-one million, two hundred seventy-four thousand, three hundred sixteen".