222222100121 has 16 divisors (see below), whose sum is σ = 257797039104. Its totient is φ = 187605239184.

The previous prime is 222222100109. The next prime is 222222100129. The reversal of 222222100121 is 121001222222.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 222222100121 - 2³⁰ = 221148358297 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 222222100121.

It is not an unprimeable number, because it can be changed into a prime (222222100129) 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, 3496796 + ... + 3559778.

It is an arithmetic number, because the mean of its divisors is an integer number (16112314944).

Almost surely, 2^222222100121 is an apocalyptic number.

It is an amenable number.

222222100121 is a deficient number, since it is larger than the sum of its proper divisors (35574938983).

222222100121 is an equidigital number, since it uses as much as digits as its factorization.

222222100121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70580.

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

Adding to 222222100121 its reverse (121001222222), we get a palindrome (343223322343).

The spelling of 222222100121 in words is "two hundred twenty-two billion, two hundred twenty-two million, one hundred thousand, one hundred twenty-one".