21977099534 has 32 divisors (see below), whose sum is σ = 36824852064. Its totient is φ = 9771632640.

The previous prime is 21977099527. The next prime is 21977099539. The reversal of 21977099534 is 43599077912.

It is a self number, because there is not a number n which added to its sum of digits gives 21977099534.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21977099539) 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, 53027 + ... + 216254.

It is an arithmetic number, because the mean of its divisors is an integer number (1150776627).

Almost surely, 2^21977099534 is an apocalyptic number.

21977099534 is a deficient number, since it is larger than the sum of its proper divisors (14847752530).

21977099534 is a wasteful number, since it uses less digits than its factorization.

21977099534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269412.

The product of its (nonzero) digits is 4286520, while the sum is 56.

The spelling of 21977099534 in words is "twenty-one billion, nine hundred seventy-seven million, ninety-nine thousand, five hundred thirty-four".