21966131292 has 24 divisors (see below), whose sum is σ = 58576350336. Its totient is φ = 6276037488.

The previous prime is 21966131281. The next prime is 21966131387. The reversal of 21966131292 is 29213166912.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130750698 + ... + 130750865.

It is an arithmetic number, because the mean of its divisors is an integer number (2440681264).

Almost surely, 2^21966131292 is an apocalyptic number.

It is an amenable number.

21966131292 is an abundant number, since it is smaller than the sum of its proper divisors (36610219044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21966131292 is a wasteful number, since it uses less digits than its factorization.

21966131292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261501577 (or 261501575 counting only the distinct ones).

The product of its digits is 69984, while the sum is 42.

The spelling of 21966131292 in words is "twenty-one billion, nine hundred sixty-six million, one hundred thirty-one thousand, two hundred ninety-two".