222221121 has 16 divisors (see below), whose sum is σ = 299103168. Its totient is φ = 146750400.

The previous prime is 222221071. The next prime is 222221137. The reversal of 222221121 is 121122222.

It is not a de Polignac number, because 222221121 - 2⁷ = 222220993 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 222221121.

It is not an unprimeable number, because it can be changed into a prime (222221221) 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, 171486 + ... + 172776.

It is an arithmetic number, because the mean of its divisors is an integer number (18693948).

Almost surely, 2^222221121 is an apocalyptic number.

It is an amenable number.

222221121 is a deficient number, since it is larger than the sum of its proper divisors (76882047).

222221121 is a wasteful number, since it uses less digits than its factorization.

222221121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1792.

The product of its digits is 64, while the sum is 15.

The square root of 222221121 is about 14907.0829138366. The cubic root of 222221121 is about 605.7058637489.

Adding to 222221121 its reverse (121122222), we get a palindrome (343343343).

The spelling of 222221121 in words is "two hundred twenty-two million, two hundred twenty-one thousand, one hundred twenty-one".