21360772 has 12 divisors (see below), whose sum is σ = 39580380. Its totient is φ = 10052096.

The previous prime is 21360761. The next prime is 21360799. The reversal of 21360772 is 27706312.

It can be written as a sum of positive squares in 2 ways, for example, as 19660356 + 1700416 = 4434^2 + 1304^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21360772.

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, 156997 + ... + 157132.

It is an arithmetic number, because the mean of its divisors is an integer number (3298365).

Almost surely, 2^21360772 is an apocalyptic number.

It is an amenable number.

21360772 is a deficient number, since it is larger than the sum of its proper divisors (18219608).

21360772 is a wasteful number, since it uses less digits than its factorization.

21360772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314150 (or 314148 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 28.

The square root of 21360772 is about 4621.7715218301. The cubic root of 21360772 is about 277.4633644789.

The spelling of 21360772 in words is "twenty-one million, three hundred sixty thousand, seven hundred seventy-two".