21964220736 has 56 divisors (see below), whose sum is σ = 58124811360. Its totient is φ = 7320003072.

The previous prime is 21964220713. The next prime is 21964220743. The reversal of 21964220736 is 63702246912.

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, 1632790 + ... + 1646186.

It is an arithmetic number, because the mean of its divisors is an integer number (1037943060).

Almost surely, 2^21964220736 is an apocalyptic number.

It is an amenable number.

21964220736 is an abundant number, since it is smaller than the sum of its proper divisors (36160590624).

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

21964220736 is a wasteful number, since it uses less digits than its factorization.

21964220736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21951 (or 21941 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 42.

The spelling of 21964220736 in words is "twenty-one billion, nine hundred sixty-four million, two hundred twenty thousand, seven hundred thirty-six".