222001222121 has 16 divisors (see below), whose sum is σ = 256363973376. Its totient is φ = 188301044736.

The previous prime is 222001222087. The next prime is 222001222141. The reversal of 222001222121 is 121222100222.

It is a happy number.

It is not a de Polignac number, because 222001222121 - 2¹⁸ = 222000959977 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 222001222121.

It is not an unprimeable number, because it can be changed into a prime (222001222141) 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, 7105085 + ... + 7136261.

It is an arithmetic number, because the mean of its divisors is an integer number (16022748336).

Almost surely, 2^222001222121 is an apocalyptic number.

It is an amenable number.

222001222121 is a deficient number, since it is larger than the sum of its proper divisors (34362751255).

222001222121 is a wasteful number, since it uses less digits than its factorization.

222001222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41768.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 222001222121 its reverse (121222100222), we get a palindrome (343223322343).

The spelling of 222001222121 in words is "two hundred twenty-two billion, one million, two hundred twenty-two thousand, one hundred twenty-one".