121201011220021 has 2 divisors, whose sum is σ = 121201011220022. Its totient is φ = 121201011220020.

The previous prime is 121201011219983. The next prime is 121201011220057. The reversal of 121201011220021 is 120022110102121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73537245048996 + 47663766171025 = 8575386^2 + 6903895^2 .

It is an emirp because it is prime and its reverse (120022110102121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121201011220021 - 2¹¹ = 121201011217973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121201011219977 and 121201011220004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121201011220921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60600505610010 + 60600505610011.

It is an arithmetic number, because the mean of its divisors is an integer number (60600505610011).

Almost surely, 2^{121201011220021} is an apocalyptic number.

It is an amenable number.

121201011220021 is a deficient number, since it is larger than the sum of its proper divisors (1).

121201011220021 is an equidigital number, since it uses as much as digits as its factorization.

121201011220021 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 16.

Adding to 121201011220021 its reverse (120022110102121), we get a palindrome (241223121322142).

The spelling of 121201011220021 in words is "one hundred twenty-one trillion, two hundred one billion, eleven million, two hundred twenty thousand, twenty-one".