220265520521621 has 4 divisors (see below), whose sum is σ = 221496054156000. Its totient is φ = 219034986887244.

The previous prime is 220265520521611. The next prime is 220265520521633. The reversal of 220265520521621 is 126125025562022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 220265520521621 - 2²² = 220265516327317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220265520521611) 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 3 ways as a sum of consecutive naturals, for example, 615266816921 + ... + 615266817278.

It is an arithmetic number, because the mean of its divisors is an integer number (55374013539000).

Almost surely, 2^{220265520521621} is an apocalyptic number.

It is an amenable number.

220265520521621 is a deficient number, since it is larger than the sum of its proper divisors (1230533634379).

220265520521621 is a wasteful number, since it uses less digits than its factorization.

220265520521621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1230533634378.

The product of its (nonzero) digits is 288000, while the sum is 41.

The spelling of 220265520521621 in words is "two hundred twenty trillion, two hundred sixty-five billion, five hundred twenty million, five hundred twenty-one thousand, six hundred twenty-one".