21453372792 has 96 divisors (see below), whose sum is σ = 59452099200. Its totient is φ = 6986564928.

The previous prime is 21453372761. The next prime is 21453372823. The reversal of 21453372792 is 29727335412.

21453372792 is a `hidden beast` number, since 2 + 1 + 4 + 533 + 7 + 27 + 92 = 666.

It is an interprime number because it is at equal distance from previous prime (21453372761) and next prime (21453372823).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 676933 + ... + 707915.

It is an arithmetic number, because the mean of its divisors is an integer number (619292700).

Almost surely, 2^21453372792 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21453372792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29726049600).

21453372792 is an abundant number, since it is smaller than the sum of its proper divisors (37998726408).

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

21453372792 is a wasteful number, since it uses less digits than its factorization.

21453372792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31217 (or 31210 counting only the distinct ones).

The product of its digits is 635040, while the sum is 45.

The spelling of 21453372792 in words is "twenty-one billion, four hundred fifty-three million, three hundred seventy-two thousand, seven hundred ninety-two".