21902542761 has 32 divisors (see below), whose sum is σ = 32048824320. Its totient is φ = 13195094400.

The previous prime is 21902542757. The next prime is 21902542769. The reversal of 21902542761 is 16724520912.

It is not a de Polignac number, because 21902542761 - 2² = 21902542757 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21902542769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4281141 + ... + 4286253.

It is an arithmetic number, because the mean of its divisors is an integer number (1001525760).

Almost surely, 2^21902542761 is an apocalyptic number.

It is an amenable number.

21902542761 is a deficient number, since it is larger than the sum of its proper divisors (10146281559).

21902542761 is a wasteful number, since it uses less digits than its factorization.

21902542761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5877.

The product of its (nonzero) digits is 60480, while the sum is 39.

The spelling of 21902542761 in words is "twenty-one billion, nine hundred two million, five hundred forty-two thousand, seven hundred sixty-one".