121220110112021 has 2 divisors, whose sum is σ = 121220110112022. Its totient is φ = 121220110112020.

The previous prime is 121220110111993. The next prime is 121220110112039. The reversal of 121220110112021 is 120211011022121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91294680780625 + 29925429331396 = 9554825^2 + 5470414^2 .

It is a cyclic number.

It is not a de Polignac number, because 121220110112021 - 2⁶ = 121220110111957 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121220110112221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610055056010 + 60610055056011.

It is an arithmetic number, because the mean of its divisors is an integer number (60610055056011).

Almost surely, 2^{121220110112021} is an apocalyptic number.

It is an amenable number.

121220110112021 is a deficient number, since it is larger than the sum of its proper divisors (1).

121220110112021 is an equidigital number, since it uses as much as digits as its factorization.

121220110112021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 121220110112021 its reverse (120211011022121), we get a palindrome (241431121134142).

The spelling of 121220110112021 in words is "one hundred twenty-one trillion, two hundred twenty billion, one hundred ten million, one hundred twelve thousand, twenty-one".