21620547113634 has 48 divisors (see below), whose sum is σ = 53766363710592. Its totient is φ = 6150787153344.

The previous prime is 21620547113617. The next prime is 21620547113639. The reversal of 21620547113634 is 43631174502612.

21620547113634 is a `hidden beast` number, since 2 + 1 + 6 + 2 + 0 + 5 + 4 + 7 + 1 + 1 + 3 + 634 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 21620547113634.

It is not an unprimeable number, because it can be changed into a prime (21620547113639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 368193054 + ... + 368251769.

It is an arithmetic number, because the mean of its divisors is an integer number (1120132577304).

Almost surely, 2^{21620547113634} is an apocalyptic number.

21620547113634 is an abundant number, since it is smaller than the sum of its proper divisors (32145816596958).

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

21620547113634 is a wasteful number, since it uses less digits than its factorization.

21620547113634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 736445071 (or 736445068 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

The spelling of 21620547113634 in words is "twenty-one trillion, six hundred twenty billion, five hundred forty-seven million, one hundred thirteen thousand, six hundred thirty-four".