21772797560 has 16 divisors (see below), whose sum is σ = 48988794600. Its totient is φ = 8709119008.

The previous prime is 21772797521. The next prime is 21772797619. The reversal of 21772797560 is 6579727712.

It is a congruent 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, 272159930 + ... + 272160009.

Almost surely, 2^21772797560 is an apocalyptic number.

21772797560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21772797560 is an abundant number, since it is smaller than the sum of its proper divisors (27215997040).

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

21772797560 is a wasteful number, since it uses less digits than its factorization.

21772797560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544319950 (or 544319946 counting only the distinct ones).

The product of its (nonzero) digits is 2593080, while the sum is 53.

The spelling of 21772797560 in words is "twenty-one billion, seven hundred seventy-two million, seven hundred ninety-seven thousand, five hundred sixty".