21938735277 has 32 divisors (see below), whose sum is σ = 33724560000. Its totient is φ = 14078655360.

The previous prime is 21938735257. The next prime is 21938735281. The reversal of 21938735277 is 77253783912.

21938735277 is a `hidden beast` number, since 2 + 19 + 38 + 73 + 527 + 7 = 666.

It is not a de Polignac number, because 21938735277 - 2¹² = 21938731181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21938735257) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 216849 + ... + 301497.

It is an arithmetic number, because the mean of its divisors is an integer number (1053892500).

Almost surely, 2^21938735277 is an apocalyptic number.

21938735277 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

21938735277 is a deficient number, since it is larger than the sum of its proper divisors (11785824723).

21938735277 is a wasteful number, since it uses less digits than its factorization.

21938735277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85018 (or 85012 counting only the distinct ones).

The product of its digits is 4445280, while the sum is 54.

The spelling of 21938735277 in words is "twenty-one billion, nine hundred thirty-eight million, seven hundred thirty-five thousand, two hundred seventy-seven".