111210222012121 has 2 divisors, whose sum is σ = 111210222012122. Its totient is φ = 111210222012120.

The previous prime is 111210222012119. The next prime is 111210222012143. The reversal of 111210222012121 is 121210222012111.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102488896742400 + 8721325269721 = 10123680^2 + 2953189^2 .

It is a cyclic number.

It is not a de Polignac number, because 111210222012121 - 2¹ = 111210222012119 is a prime.

Together with 111210222012119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (111210222012221) 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, 55605111006060 + 55605111006061.

It is an arithmetic number, because the mean of its divisors is an integer number (55605111006061).

Almost surely, 2^{111210222012121} is an apocalyptic number.

It is an amenable number.

111210222012121 is a deficient number, since it is larger than the sum of its proper divisors (1).

111210222012121 is an equidigital number, since it uses as much as digits as its factorization.

111210222012121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 111210222012121 its reverse (121210222012111), we get a palindrome (232420444024232).

The spelling of 111210222012121 in words is "one hundred eleven trillion, two hundred ten billion, two hundred twenty-two million, twelve thousand, one hundred twenty-one".