221111120121 has 16 divisors (see below), whose sum is σ = 300813865728. Its totient is φ = 144426700800.

The previous prime is 221111120081. The next prime is 221111120123. The reversal of 221111120121 is 121021111122.

It is a happy number.

It is not a de Polignac number, because 221111120121 - 2²³ = 221102731513 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221111120121.

It is not an unprimeable number, because it can be changed into a prime (221111120123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2303665 + ... + 2397726.

It is an arithmetic number, because the mean of its divisors is an integer number (18800866608).

Almost surely, 2^221111120121 is an apocalyptic number.

It is an amenable number.

221111120121 is a deficient number, since it is larger than the sum of its proper divisors (79702745607).

221111120121 is a wasteful number, since it uses less digits than its factorization.

221111120121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4701712.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 221111120121 its reverse (121021111122), we get a palindrome (342132231243).

The spelling of 221111120121 in words is "two hundred twenty-one billion, one hundred eleven million, one hundred twenty thousand, one hundred twenty-one".