222122222121 has 4 divisors (see below), whose sum is σ = 296162962832. Its totient is φ = 148081481412.

The previous prime is 222122222107. The next prime is 222122222131. The reversal of 222122222121 is 121222221222.

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 222122222121 - 2⁹ = 222122221609 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 (222122222131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37020370351 + ... + 37020370356.

It is an arithmetic number, because the mean of its divisors is an integer number (74040740708).

Almost surely, 2^222122222121 is an apocalyptic number.

It is an amenable number.

222122222121 is a deficient number, since it is larger than the sum of its proper divisors (74040740711).

222122222121 is an equidigital number, since it uses as much as digits as its factorization.

222122222121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74040740710.

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

Adding to 222122222121 its reverse (121222221222), we get a palindrome (343344443343).

The spelling of 222122222121 in words is "two hundred twenty-two billion, one hundred twenty-two million, two hundred twenty-two thousand, one hundred twenty-one".