121210111221137 has 2 divisors, whose sum is σ = 121210111221138. Its totient is φ = 121210111221136.

The previous prime is 121210111221079. The next prime is 121210111221139. The reversal of 121210111221137 is 731122111012121.

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., 121188481342096 + 21629879041 = 11008564^2 + 147071^2 .

It is a cyclic number.

It is not a de Polignac number, because 121210111221137 - 2²⁶ = 121210044112273 is a prime.

Together with 121210111221139, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121210111221139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60605055610568 + 60605055610569.

It is an arithmetic number, because the mean of its divisors is an integer number (60605055610569).

Almost surely, 2^{121210111221137} is an apocalyptic number.

It is an amenable number.

121210111221137 is a deficient number, since it is larger than the sum of its proper divisors (1).

121210111221137 is an equidigital number, since it uses as much as digits as its factorization.

121210111221137 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 26.

Adding to 121210111221137 its reverse (731122111012121), we get a palindrome (852332222233258).

The spelling of 121210111221137 in words is "one hundred twenty-one trillion, two hundred ten billion, one hundred eleven million, two hundred twenty-one thousand, one hundred thirty-seven".