21964857988 has 24 divisors (see below), whose sum is σ = 39322080000. Its totient is φ = 10730760768.

The previous prime is 21964857949. The next prime is 21964857989. The reversal of 21964857988 is 88975846912.

It is not an unprimeable number, because it can be changed into a prime (21964857989) 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, 15088 + ... + 210136.

It is an arithmetic number, because the mean of its divisors is an integer number (1638420000).

Almost surely, 2^21964857988 is an apocalyptic number.

It is an amenable number.

21964857988 is a deficient number, since it is larger than the sum of its proper divisors (17357222012).

21964857988 is a wasteful number, since it uses less digits than its factorization.

21964857988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195699 (or 195697 counting only the distinct ones).

The product of its digits is 69672960, while the sum is 67.

The spelling of 21964857988 in words is "twenty-one billion, nine hundred sixty-four million, eight hundred fifty-seven thousand, nine hundred eighty-eight".