222120121 has 4 divisors (see below), whose sum is σ = 222739200. Its totient is φ = 221501044.

The previous prime is 222120097. The next prime is 222120133. The reversal of 222120121 is 121021222.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 222120121 - 2⁹ = 222119609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (222120161) 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, 309001 + ... + 309718.

It is an arithmetic number, because the mean of its divisors is an integer number (55684800).

Almost surely, 2^222120121 is an apocalyptic number.

It is an amenable number.

222120121 is a deficient number, since it is larger than the sum of its proper divisors (619079).

222120121 is an equidigital number, since it uses as much as digits as its factorization.

222120121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 619078.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 222120121 is about 14903.6948774457. The cubic root of 222120121 is about 605.6140849499.

Adding to 222120121 its reverse (121021222), we get a palindrome (343141343).

It can be divided in two parts, 2221201 and 21, that added together give a palindrome (2221222).

The spelling of 222120121 in words is "two hundred twenty-two million, one hundred twenty thousand, one hundred twenty-one".