21964220732 has 24 divisors (see below), whose sum is σ = 38830838592. Its totient is φ = 10869768000.

The previous prime is 21964220713. The next prime is 21964220743. The reversal of 21964220732 is 23702246912.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1537382 + ... + 1551602.

It is an arithmetic number, because the mean of its divisors is an integer number (1617951608).

Almost surely, 2^21964220732 is an apocalyptic number.

It is an amenable number.

21964220732 is a deficient number, since it is larger than the sum of its proper divisors (16866617860).

21964220732 is a wasteful number, since it uses less digits than its factorization.

21964220732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18149 (or 18147 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 38.

The spelling of 21964220732 in words is "twenty-one billion, nine hundred sixty-four million, two hundred twenty thousand, seven hundred thirty-two".