221010020120121 has 4 divisors (see below), whose sum is σ = 294680026826832. Its totient is φ = 147340013413412.

The previous prime is 221010020120119. The next prime is 221010020120137. The reversal of 221010020120121 is 121021020010122.

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 221010020120121 - 2¹ = 221010020120119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221010020120121.

It is not an unprimeable number, because it can be changed into a prime (221010020120171) 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, 36835003353351 + ... + 36835003353356.

It is an arithmetic number, because the mean of its divisors is an integer number (73670006706708).

Almost surely, 2^{221010020120121} is an apocalyptic number.

It is an amenable number.

221010020120121 is a deficient number, since it is larger than the sum of its proper divisors (73670006706711).

221010020120121 is an equidigital number, since it uses as much as digits as its factorization.

221010020120121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73670006706710.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 221010020120121 its reverse (121021020010122), we get a palindrome (342031040130243).

The spelling of 221010020120121 in words is "two hundred twenty-one trillion, ten billion, twenty million, one hundred twenty thousand, one hundred twenty-one".