21234177492 has 48 divisors (see below), whose sum is σ = 54408635904. Its totient is φ = 6391980000.

The previous prime is 21234177487. The next prime is 21234177511. The reversal of 21234177492 is 29477143212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 512734 + ... + 552597.

It is an arithmetic number, because the mean of its divisors is an integer number (1133513248).

Almost surely, 2^21234177492 is an apocalyptic number.

21234177492 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21234177492 is an abundant number, since it is smaller than the sum of its proper divisors (33174458412).

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

21234177492 is a wasteful number, since it uses less digits than its factorization.

21234177492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1065500 (or 1065498 counting only the distinct ones).

The product of its digits is 169344, while the sum is 42.

The spelling of 21234177492 in words is "twenty-one billion, two hundred thirty-four million, one hundred seventy-seven thousand, four hundred ninety-two".