21512672 has 12 divisors (see below), whose sum is σ = 42353136. Its totient is φ = 10756320.

The previous prime is 21512669. The next prime is 21512713. The reversal of 21512672 is 27621512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336104 + ... + 336167.

It is an arithmetic number, because the mean of its divisors is an integer number (3529428).

Almost surely, 2^21512672 is an apocalyptic number.

It is an amenable number.

21512672 is a deficient number, since it is larger than the sum of its proper divisors (20840464).

21512672 is an equidigital number, since it uses as much as digits as its factorization.

21512672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 672281 (or 672273 counting only the distinct ones).

The product of its digits is 1680, while the sum is 26.

The square root of 21512672 is about 4638.1755033634. The cubic root of 21512672 is about 278.1195076473.

The spelling of 21512672 in words is "twenty-one million, five hundred twelve thousand, six hundred seventy-two".