21067552077 has 48 divisors (see below), whose sum is σ = 34178708928. Its totient is φ = 11379432960.

The previous prime is 21067552069. The next prime is 21067552081. The reversal of 21067552077 is 77025576012.

It is not a de Polignac number, because 21067552077 - 2³ = 21067552069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21067552057) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 331593 + ... + 389985.

It is an arithmetic number, because the mean of its divisors is an integer number (712056436).

Almost surely, 2^21067552077 is an apocalyptic number.

It is an amenable number.

21067552077 is a deficient number, since it is larger than the sum of its proper divisors (13111156851).

21067552077 is a wasteful number, since it uses less digits than its factorization.

21067552077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58478 (or 58449 counting only the distinct ones).

The product of its (nonzero) digits is 205800, while the sum is 42.

The spelling of 21067552077 in words is "twenty-one billion, sixty-seven million, five hundred fifty-two thousand, seventy-seven".