222220121 has 4 divisors (see below), whose sum is σ = 229388544. Its totient is φ = 215051700.

The previous prime is 222220111. The next prime is 222220177. The reversal of 222220121 is 121022222.

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 a de Polignac number, because none of the positive numbers 2^k-222220121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222220096 and 222220105.

It is not an unprimeable number, because it can be changed into a prime (222220111) 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, 3584165 + ... + 3584226.

It is an arithmetic number, because the mean of its divisors is an integer number (57347136).

Almost surely, 2^222220121 is an apocalyptic number.

It is an amenable number.

222220121 is a deficient number, since it is larger than the sum of its proper divisors (7168423).

222220121 is an equidigital number, since it uses as much as digits as its factorization.

222220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7168422.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 222220121 is about 14907.0493726961. The cubic root of 222220121 is about 605.7049551843.

Adding to 222220121 its reverse (121022222), we get a palindrome (343242343).

It can be divided in two parts, 2222201 and 21, that added together give a palindrome (2222222).

The spelling of 222220121 in words is "two hundred twenty-two million, two hundred twenty thousand, one hundred twenty-one".