21977052279 has 48 divisors (see below), whose sum is σ = 37490116608. Its totient is φ = 11345600448.

The previous prime is 21977052271. The next prime is 21977052283. The reversal of 21977052279 is 97225077912.

It is not a de Polignac number, because 21977052279 - 2³ = 21977052271 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21977052271) 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, 32527 + ... + 212160.

It is an arithmetic number, because the mean of its divisors is an integer number (781044096).

Almost surely, 2^21977052279 is an apocalyptic number.

21977052279 is a deficient number, since it is larger than the sum of its proper divisors (15513064329).

21977052279 is a wasteful number, since it uses less digits than its factorization.

21977052279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244764 (or 244757 counting only the distinct ones).

The product of its (nonzero) digits is 1111320, while the sum is 51.

The spelling of 21977052279 in words is "twenty-one billion, nine hundred seventy-seven million, fifty-two thousand, two hundred seventy-nine".