21088707577 has 16 divisors (see below), whose sum is σ = 24962808960. Its totient is φ = 17431481088.

The previous prime is 21088707557. The next prime is 21088707583. The reversal of 21088707577 is 77570788012.

It is not a de Polignac number, because 21088707577 - 2¹⁵ = 21088674809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21088707557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105073 + ... + 230689.

It is an arithmetic number, because the mean of its divisors is an integer number (1560175560).

Almost surely, 2^21088707577 is an apocalyptic number.

It is an amenable number.

21088707577 is a deficient number, since it is larger than the sum of its proper divisors (3874101383).

21088707577 is a wasteful number, since it uses less digits than its factorization.

21088707577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126480.

The product of its (nonzero) digits is 1536640, while the sum is 52.

The spelling of 21088707577 in words is "twenty-one billion, eighty-eight million, seven hundred seven thousand, five hundred seventy-seven".