222106121 has 2 divisors, whose sum is σ = 222106122. Its totient is φ = 222106120.

The previous prime is 222106117. The next prime is 222106123. The reversal of 222106121 is 121601222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 142539721 + 79566400 = 11939^2 + 8920^2 .

It is a cyclic number.

It is not a de Polignac number, because 222106121 - 2² = 222106117 is a prime.

It is a super-2 number, since 2×222106121² = 98662257971333282, which contains 22 as substring.

Together with 222106123, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_12232151 and since 222106121 and 12232151 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 222106121.

It is not a weakly prime, because it can be changed into another prime (222106123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111053060 + 111053061.

It is an arithmetic number, because the mean of its divisors is an integer number (111053061).

Almost surely, 2^222106121 is an apocalyptic number.

It is an amenable number.

222106121 is a deficient number, since it is larger than the sum of its proper divisors (1).

222106121 is an equidigital number, since it uses as much as digits as its factorization.

222106121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 222106121 is about 14903.2251878578. The cubic root of 222106121 is about 605.6013609408.

Adding to 222106121 its reverse (121601222), we get a palindrome (343707343).

The spelling of 222106121 in words is "two hundred twenty-two million, one hundred six thousand, one hundred twenty-one".