222121111121 has 16 divisors (see below), whose sum is σ = 289460997504. Its totient is φ = 165406281984.

The previous prime is 222121111109. The next prime is 222121111153. The reversal of 222121111121 is 121111121222.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222121111121 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a self number, because there is not a number n which added to its sum of digits gives 222121111121.

It is not an unprimeable number, because it can be changed into a prime (222121110121) 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, 71789375 + ... + 71792468.

It is an arithmetic number, because the mean of its divisors is an integer number (18091312344).

Almost surely, 2^222121111121 is an apocalyptic number.

It is an amenable number.

222121111121 is a deficient number, since it is larger than the sum of its proper divisors (67339886383).

222121111121 is a wasteful number, since it uses less digits than its factorization.

222121111121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143581880.

The product of its digits is 32, while the sum is 17.

Adding to 222121111121 its reverse (121111121222), we get a palindrome (343232232343).

It can be divided in two parts, 222 and 121111121, that multiplied together give a palindrome (26886668862).

The spelling of 222121111121 in words is "two hundred twenty-two billion, one hundred twenty-one million, one hundred eleven thousand, one hundred twenty-one".