21631152772 has 24 divisors (see below), whose sum is σ = 39435066720. Its totient is φ = 10372933440.

The previous prime is 21631152761. The next prime is 21631152773. The reversal of 21631152772 is 27725113612.

It is not an unprimeable number, because it can be changed into a prime (21631152773) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1108098 + ... + 1127449.

It is an arithmetic number, because the mean of its divisors is an integer number (1643127780).

Almost surely, 2^21631152772 is an apocalyptic number.

It is an amenable number.

21631152772 is a deficient number, since it is larger than the sum of its proper divisors (17803913948).

21631152772 is a wasteful number, since it uses less digits than its factorization.

21631152772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2235651 (or 2235649 counting only the distinct ones).

The product of its digits is 35280, while the sum is 37.

The spelling of 21631152772 in words is "twenty-one billion, six hundred thirty-one million, one hundred fifty-two thousand, seven hundred seventy-two".