21304716 has 24 divisors (see below), whose sum is σ = 51873024. Its totient is φ = 6792720.

The previous prime is 21304709. The next prime is 21304721. The reversal of 21304716 is 61740312.

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, 38320 + ... + 38871.

It is an arithmetic number, because the mean of its divisors is an integer number (2161376).

Almost surely, 2^21304716 is an apocalyptic number.

It is an amenable number.

21304716 is an abundant number, since it is smaller than the sum of its proper divisors (30568308).

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

21304716 is a wasteful number, since it uses less digits than its factorization.

21304716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77221 (or 77219 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 21304716 is about 4615.7031966971. The cubic root of 21304716 is about 277.2204408049.

The spelling of 21304716 in words is "twenty-one million, three hundred four thousand, seven hundred sixteen".