222001121 has 2 divisors, whose sum is σ = 222001122. Its totient is φ = 222001120.

The previous prime is 222001099. The next prime is 222001141. The reversal of 222001121 is 121100222.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 212110096 + 9891025 = 14564^2 + 3145^2 .

It is a cyclic number.

It is not a de Polignac number, because 222001121 - 2⁶ = 222001057 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (222001141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111000560 + 111000561.

It is an arithmetic number, because the mean of its divisors is an integer number (111000561).

Almost surely, 2^222001121 is an apocalyptic number.

It is an amenable number.

222001121 is a deficient number, since it is larger than the sum of its proper divisors (1).

222001121 is an equidigital number, since it uses as much as digits as its factorization.

222001121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 222001121 is about 14899.7020440007. The cubic root of 222001121 is about 605.5059138251.

Adding to 222001121 its reverse (121100222), we get a palindrome (343101343).

The spelling of 222001121 in words is "two hundred twenty-two million, one thousand, one hundred twenty-one".