21877038272 has 28 divisors (see below), whose sum is σ = 44812646976. Its totient is φ = 10585662720.

The previous prime is 21877038203. The next prime is 21877038329. The reversal of 21877038272 is 27283077812.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5511383 + ... + 5515350.

Almost surely, 2^21877038272 is an apocalyptic number.

It is an amenable number.

21877038272 is an abundant number, since it is smaller than the sum of its proper divisors (22935608704).

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

21877038272 is a wasteful number, since it uses less digits than its factorization.

21877038272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11026776 (or 11026766 counting only the distinct ones).

The product of its (nonzero) digits is 526848, while the sum is 47.

The spelling of 21877038272 in words is "twenty-one billion, eight hundred seventy-seven million, thirty-eight thousand, two hundred seventy-two".