21075312 has 40 divisors (see below), whose sum is σ = 55777680. Its totient is φ = 6853120.

The previous prime is 21075283. The next prime is 21075347. The reversal of 21075312 is 21357012.

It is a congruent number.

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, 3387 + ... + 7322.

It is an arithmetic number, because the mean of its divisors is an integer number (1394442).

Almost surely, 2^21075312 is an apocalyptic number.

It is an amenable number.

21075312 is an abundant number, since it is smaller than the sum of its proper divisors (34702368).

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

21075312 is a wasteful number, since it uses less digits than its factorization.

21075312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10761 (or 10755 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 21075312 is about 4590.7855536934. The cubic root of 21075312 is about 276.2218338365.

The spelling of 21075312 in words is "twenty-one million, seventy-five thousand, three hundred twelve".