21529794364 has 48 divisors (see below), whose sum is σ = 43226029728. Its totient is φ = 9294870528.

The previous prime is 21529794257. The next prime is 21529794367. The reversal of 21529794364 is 46349792512.

It is a super-2 number, since 2×21529794364² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21529794367) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69384 + ... + 218800.

It is an arithmetic number, because the mean of its divisors is an integer number (900542286).

Almost surely, 2^21529794364 is an apocalyptic number.

It is an amenable number.

21529794364 is an abundant number, since it is smaller than the sum of its proper divisors (21696235364).

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

21529794364 is a wasteful number, since it uses less digits than its factorization.

21529794364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149614 (or 149612 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 52.

The spelling of 21529794364 in words is "twenty-one billion, five hundred twenty-nine million, seven hundred ninety-four thousand, three hundred sixty-four".