21601677265572 has 48 divisors (see below), whose sum is σ = 51248054289600. Its totient is φ = 7080353461632.

The previous prime is 21601677265537. The next prime is 21601677265573. The reversal of 21601677265572 is 27556277610612.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21601677265573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23670447 + ... + 24566102.

It is an arithmetic number, because the mean of its divisors is an integer number (1067667797700).

Almost surely, 2^{21601677265572} is an apocalyptic number.

It is an amenable number.

21601677265572 is an abundant number, since it is smaller than the sum of its proper divisors (29646377024028).

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

21601677265572 is a wasteful number, since it uses less digits than its factorization.

21601677265572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48237180 (or 48237178 counting only the distinct ones).

The product of its (nonzero) digits is 14817600, while the sum is 57.

The spelling of 21601677265572 in words is "twenty-one trillion, six hundred one billion, six hundred seventy-seven million, two hundred sixty-five thousand, five hundred seventy-two".