21620546231634 has 64 divisors (see below), whose sum is σ = 56680592302080. Its totient is φ = 5978031212880.

The previous prime is 21620546231593. The next prime is 21620546231719. The reversal of 21620546231634 is 43613264502612.

21620546231634 is a `hidden beast` number, since 2 + 1 + 6 + 2 + 0 + 5 + 4 + 6 + 2 + 3 + 1 + 634 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 21620546231634.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 922523964 + ... + 922547399.

It is an arithmetic number, because the mean of its divisors is an integer number (885634254720).

Almost surely, 2^{21620546231634} is an apocalyptic number.

21620546231634 is an abundant number, since it is smaller than the sum of its proper divisors (35060046070446).

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

21620546231634 is a wasteful number, since it uses less digits than its factorization.

21620546231634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1845071412 (or 1845071406 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 45.

The spelling of 21620546231634 in words is "twenty-one trillion, six hundred twenty billion, five hundred forty-six million, two hundred thirty-one thousand, six hundred thirty-four".