222405121 has 2 divisors, whose sum is σ = 222405122. Its totient is φ = 222405120.

The previous prime is 222405109. The next prime is 222405137. The reversal of 222405121 is 121504222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 157377025 + 65028096 = 12545^2 + 8064^2 .

It is a cyclic number.

It is not a de Polignac number, because 222405121 - 2⁷ = 222404993 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (222405151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111202560 + 111202561.

It is an arithmetic number, because the mean of its divisors is an integer number (111202561).

Almost surely, 2^222405121 is an apocalyptic number.

It is an amenable number.

222405121 is a deficient number, since it is larger than the sum of its proper divisors (1).

222405121 is an equidigital number, since it uses as much as digits as its factorization.

222405121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 222405121 is about 14913.2531997549. The cubic root of 222405121 is about 605.8729932763.

Adding to 222405121 its reverse (121504222), we get a palindrome (343909343).

The spelling of 222405121 in words is "two hundred twenty-two million, four hundred five thousand, one hundred twenty-one".