21653286792 has 32 divisors (see below), whose sum is σ = 54137522880. Its totient is φ = 7217188160.

The previous prime is 21653286757. The next prime is 21653286797. The reversal of 21653286792 is 29768235612.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21653286797) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 362317 + ... + 417827.

It is an arithmetic number, because the mean of its divisors is an integer number (1691797590).

Almost surely, 2^21653286792 is an apocalyptic number.

It is an amenable number.

21653286792 is an abundant number, since it is smaller than the sum of its proper divisors (32484236088).

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

21653286792 is a wasteful number, since it uses less digits than its factorization.

21653286792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71773 (or 71769 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 51.

The spelling of 21653286792 in words is "twenty-one billion, six hundred fifty-three million, two hundred eighty-six thousand, seven hundred ninety-two".