21220862764536 has 48 divisors (see below), whose sum is σ = 59601805918200. Its totient is φ = 7073620920864.

The previous prime is 21220862764511. The next prime is 21220862764559. The reversal of 21220862764536 is 63546726802212.

21220862764536 is a `hidden beast` number, since 2 + 1 + 2 + 2 + 0 + 8 + 627 + 6 + 4 + 5 + 3 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5458038891 + ... + 5458042778.

Almost surely, 2^{21220862764536} is an apocalyptic number.

It is an amenable number.

21220862764536 is an abundant number, since it is smaller than the sum of its proper divisors (38380943153664).

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

21220862764536 is a wasteful number, since it uses less digits than its factorization.

21220862764536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10916081690 (or 10916081674 counting only the distinct ones).

The product of its (nonzero) digits is 11612160, while the sum is 54.

The spelling of 21220862764536 in words is "twenty-one trillion, two hundred twenty billion, eight hundred sixty-two million, seven hundred sixty-four thousand, five hundred thirty-six".