21377634873777 has 48 divisors (see below), whose sum is σ = 38008775983360. Its totient is φ = 11274901059456.

The previous prime is 21377634873739. The next prime is 21377634873797. The reversal of 21377634873777 is 77737843677312.

21377634873777 is a `hidden beast` number, since 2 + 1 + 3 + 7 + 76 + 3 + 487 + 3 + 7 + 77 = 666.

It is not a de Polignac number, because 21377634873777 - 2⁷ = 21377634873649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21377634873797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6231783 + ... + 9032739.

Almost surely, 2^{21377634873777} is an apocalyptic number.

It is an amenable number.

21377634873777 is a deficient number, since it is larger than the sum of its proper divisors (16631141109583).

21377634873777 is a wasteful number, since it uses less digits than its factorization.

21377634873777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2810302 (or 2810299 counting only the distinct ones).

The product of its digits is 1219784832, while the sum is 72.

The spelling of 21377634873777 in words is "twenty-one trillion, three hundred seventy-seven billion, six hundred thirty-four million, eight hundred seventy-three thousand, seven hundred seventy-seven".