21940943768 has 32 divisors (see below), whose sum is σ = 41357606400. Its totient is φ = 10912353312.

The previous prime is 21940943719. The next prime is 21940943807. The reversal of 21940943768 is 86734904912.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1842971 + ... + 1854837.

It is an arithmetic number, because the mean of its divisors is an integer number (1292425200).

Almost surely, 2^21940943768 is an apocalyptic number.

It is an amenable number.

21940943768 is a deficient number, since it is larger than the sum of its proper divisors (19416662632).

21940943768 is a wasteful number, since it uses less digits than its factorization.

21940943768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13079 (or 13075 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 53.

The spelling of 21940943768 in words is "twenty-one billion, nine hundred forty million, nine hundred forty-three thousand, seven hundred sixty-eight".