21952239177 has 16 divisors (see below), whose sum is σ = 31936651200. Its totient is φ = 13301836800.

The previous prime is 21952239151. The next prime is 21952239181. The reversal of 21952239177 is 77193225912.

It is not a de Polignac number, because 21952239177 - 2¹¹ = 21952237129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21952239107) 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, 118777 + ... + 240857.

It is an arithmetic number, because the mean of its divisors is an integer number (1996040700).

Almost surely, 2^21952239177 is an apocalyptic number.

It is an amenable number.

21952239177 is a deficient number, since it is larger than the sum of its proper divisors (9984412023).

21952239177 is a wasteful number, since it uses less digits than its factorization.

21952239177 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127544.

The product of its digits is 476280, while the sum is 48.

The spelling of 21952239177 in words is "twenty-one billion, nine hundred fifty-two million, two hundred thirty-nine thousand, one hundred seventy-seven".