220921057579 has 4 divisors (see below), whose sum is σ = 230526320976. Its totient is φ = 211315794184.

The previous prime is 220921057531. The next prime is 220921057583. The reversal of 220921057579 is 975750129022.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 220921057579 - 2⁷ = 220921057451 is a prime.

It is a super-2 number, since 2×220921057579² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220921057879) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4802631664 + ... + 4802631709.

It is an arithmetic number, because the mean of its divisors is an integer number (57631580244).

Almost surely, 2^220921057579 is an apocalyptic number.

220921057579 is a deficient number, since it is larger than the sum of its proper divisors (9605263397).

220921057579 is an equidigital number, since it uses as much as digits as its factorization.

220921057579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9605263396.

The product of its (nonzero) digits is 793800, while the sum is 49.

The spelling of 220921057579 in words is "two hundred twenty billion, nine hundred twenty-one million, fifty-seven thousand, five hundred seventy-nine".