222222122121 has 4 divisors (see below), whose sum is σ = 296296162832. Its totient is φ = 148148081412.

The previous prime is 222222122071. The next prime is 222222122159. The reversal of 222222122121 is 121221222222.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 222222122121 - 2¹⁴ = 222222105737 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (222222124121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37037020351 + ... + 37037020356.

It is an arithmetic number, because the mean of its divisors is an integer number (74074040708).

Almost surely, 2^222222122121 is an apocalyptic number.

It is an amenable number.

222222122121 is a deficient number, since it is larger than the sum of its proper divisors (74074040711).

222222122121 is an equidigital number, since it uses as much as digits as its factorization.

222222122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74074040710.

The product of its digits is 512, while the sum is 21.

Adding to 222222122121 its reverse (121221222222), we get a palindrome (343443344343).

The spelling of 222222122121 in words is "two hundred twenty-two billion, two hundred twenty-two million, one hundred twenty-two thousand, one hundred twenty-one".