21637130802652 has 24 divisors (see below), whose sum is σ = 40140116563680. Its totient is φ = 10170043084800.

The previous prime is 21637130802649. The next prime is 21637130802653. The reversal of 21637130802652 is 25620803173612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21637130802653) 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, 189569349 + ... + 189683452.

It is an arithmetic number, because the mean of its divisors is an integer number (1672504856820).

Almost surely, 2^{21637130802652} is an apocalyptic number.

It is an amenable number.

21637130802652 is a deficient number, since it is larger than the sum of its proper divisors (18502985761028).

21637130802652 is a wasteful number, since it uses less digits than its factorization.

21637130802652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379253661 (or 379253659 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 46.

The spelling of 21637130802652 in words is "twenty-one trillion, six hundred thirty-seven billion, one hundred thirty million, eight hundred two thousand, six hundred fifty-two".