221220112222121 has 32 divisors (see below), whose sum is σ = 227166551654400. Its totient is φ = 215329152729600.

The previous prime is 221220112222093. The next prime is 221220112222127. The reversal of 221220112222121 is 121222211022122.

It is a cyclic number.

It is not a de Polignac number, because 221220112222121 - 2²⁶ = 221220045113257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221220112222127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15395644025 + ... + 15395658393.

It is an arithmetic number, because the mean of its divisors is an integer number (7098954739200).

Almost surely, 2^{221220112222121} is an apocalyptic number.

It is an amenable number.

221220112222121 is a deficient number, since it is larger than the sum of its proper divisors (5946439432279).

221220112222121 is a wasteful number, since it uses less digits than its factorization.

221220112222121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17189.

The product of its (nonzero) digits is 512, while the sum is 23.

Adding to 221220112222121 its reverse (121222211022122), we get a palindrome (342442323244243).

The spelling of 221220112222121 in words is "two hundred twenty-one trillion, two hundred twenty billion, one hundred twelve million, two hundred twenty-two thousand, one hundred twenty-one".