121231002110021 has 2 divisors, whose sum is σ = 121231002110022. Its totient is φ = 121231002110020.

The previous prime is 121231002109979. The next prime is 121231002110039. The reversal of 121231002110021 is 120011200132121.

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., 115317229279396 + 5913772830625 = 10738586^2 + 2431825^2 .

It is a cyclic number.

It is not a de Polignac number, because 121231002110021 - 2⁴² = 116832955598917 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 (121231002115021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60615501055010 + 60615501055011.

It is an arithmetic number, because the mean of its divisors is an integer number (60615501055011).

Almost surely, 2^{121231002110021} is an apocalyptic number.

It is an amenable number.

121231002110021 is a deficient number, since it is larger than the sum of its proper divisors (1).

121231002110021 is an equidigital number, since it uses as much as digits as its factorization.

121231002110021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 121231002110021 its reverse (120011200132121), we get a palindrome (241242202242142).

The spelling of 121231002110021 in words is "one hundred twenty-one trillion, two hundred thirty-one billion, two million, one hundred ten thousand, twenty-one".