21776072 has 16 divisors (see below), whose sum is σ = 41440560. Its totient is φ = 10725264.

The previous prime is 21776059. The next prime is 21776081. The reversal of 21776072 is 27067712.

It is a happy 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, 19778 + ... + 20849.

It is an arithmetic number, because the mean of its divisors is an integer number (2590035).

Almost surely, 2^21776072 is an apocalyptic number.

It is an amenable number.

21776072 is a deficient number, since it is larger than the sum of its proper divisors (19664488).

21776072 is a wasteful number, since it uses less digits than its factorization.

21776072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40700 (or 40696 counting only the distinct ones).

The product of its (nonzero) digits is 8232, while the sum is 32.

The square root of 21776072 is about 4666.4839011830. The cubic root of 21776072 is about 279.2499996660.

The spelling of 21776072 in words is "twenty-one million, seven hundred seventy-six thousand, seventy-two".