21274716 has 12 divisors (see below), whose sum is σ = 49641032. Its totient is φ = 7091568.

The previous prime is 21274709. The next prime is 21274727. The reversal of 21274716 is 61747212.

21274716 is nontrivially palindromic in base 11.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×21274716² = 905227081761312, which contains 22 as substring.

It is a congruent number.

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, 886435 + ... + 886458.

Almost surely, 2^21274716 is an apocalyptic number.

It is an amenable number.

21274716 is an abundant number, since it is smaller than the sum of its proper divisors (28366316).

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

21274716 is a wasteful number, since it uses less digits than its factorization.

21274716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1772900 (or 1772898 counting only the distinct ones).

The product of its digits is 4704, while the sum is 30.

The square root of 21274716 is about 4612.4522761759. The cubic root of 21274716 is about 277.0902580489.

The spelling of 21274716 in words is "twenty-one million, two hundred seventy-four thousand, seven hundred sixteen".