222445121 has 4 divisors (see below), whose sum is σ = 232116672. Its totient is φ = 212773572.

The previous prime is 222445099. The next prime is 222445151. The reversal of 222445121 is 121544222.

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 222445121 - 2¹⁰ = 222444097 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 9671527 = 222445121 / (2 + 2 + 2 + 4 + 4 + 5 + 1 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (222445151) 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, 4835741 + ... + 4835786.

It is an arithmetic number, because the mean of its divisors is an integer number (58029168).

Almost surely, 2^222445121 is an apocalyptic number.

It is an amenable number.

222445121 is a deficient number, since it is larger than the sum of its proper divisors (9671551).

222445121 is an equidigital number, since it uses as much as digits as its factorization.

222445121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9671550.

The product of its digits is 1280, while the sum is 23.

The square root of 222445121 is about 14914.5942284730. The cubic root of 222445121 is about 605.9093135835.

Adding to 222445121 its reverse (121544222), we get a palindrome (343989343).

The spelling of 222445121 in words is "two hundred twenty-two million, four hundred forty-five thousand, one hundred twenty-one".