21755727973572 has 24 divisors (see below), whose sum is σ = 50813477210496. Its totient is φ = 7244750476128.

The previous prime is 21755727973523. The next prime is 21755727973613. The reversal of 21755727973572 is 27537972755712.

It is a junction number, because it is equal to n+sod(n) for n = 21755727973497 and 21755727973506.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 894843388 + ... + 894867699.

It is an arithmetic number, because the mean of its divisors is an integer number (2117228217104).

Almost surely, 2^{21755727973572} is an apocalyptic number.

It is an amenable number.

21755727973572 is an abundant number, since it is smaller than the sum of its proper divisors (29057749236924).

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

21755727973572 is a wasteful number, since it uses less digits than its factorization.

21755727973572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1789712107 (or 1789712105 counting only the distinct ones).

The product of its digits is 453789000, while the sum is 69.

The spelling of 21755727973572 in words is "twenty-one trillion, seven hundred fifty-five billion, seven hundred twenty-seven million, nine hundred seventy-three thousand, five hundred seventy-two".