21777992272 has 10 divisors (see below), whose sum is σ = 42194860058. Its totient is φ = 10888996128.

The previous prime is 21777992231. The next prime is 21777992303. The reversal of 21777992272 is 27229977712.

It can be written as a sum of positive squares in only one way, i.e., 19825766416 + 1952225856 = 140804^2 + 44184^2 .

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, 680562243 + ... + 680562274.

Almost surely, 2^21777992272 is an apocalyptic number.

It is an amenable number.

21777992272 is a deficient number, since it is larger than the sum of its proper divisors (20416867786).

21777992272 is a wasteful number, since it uses less digits than its factorization.

21777992272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1361124525 (or 1361124519 counting only the distinct ones).

The product of its digits is 3111696, while the sum is 55.

It can be divided in two parts, 21777 and 992272, that added together give a square (1014049 = 1007²).

The spelling of 21777992272 in words is "twenty-one billion, seven hundred seventy-seven million, nine hundred ninety-two thousand, two hundred seventy-two".