222111100121 has 2 divisors, whose sum is σ = 222111100122. Its totient is φ = 222111100120.

The previous prime is 222111100117. The next prime is 222111100139. The reversal of 222111100121 is 121001111222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 186930846025 + 35180254096 = 432355^2 + 187564^2 .

It is a cyclic number.

It is not a de Polignac number, because 222111100121 - 2² = 222111100117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 222111100096 and 222111100105.

It is not a weakly prime, because it can be changed into another prime (222111100151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111055550060 + 111055550061.

It is an arithmetic number, because the mean of its divisors is an integer number (111055550061).

Almost surely, 2^222111100121 is an apocalyptic number.

It is an amenable number.

222111100121 is a deficient number, since it is larger than the sum of its proper divisors (1).

222111100121 is an equidigital number, since it uses as much as digits as its factorization.

222111100121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 222111100121 its reverse (121001111222), we get a palindrome (343112211343).

The spelling of 222111100121 in words is "two hundred twenty-two billion, one hundred eleven million, one hundred thousand, one hundred twenty-one".