121220002010021 has 2 divisors, whose sum is σ = 121220002010022. Its totient is φ = 121220002010020.

The previous prime is 121220002009949. The next prime is 121220002010033. The reversal of 121220002010021 is 120010200022121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 100160264160100 + 21059737849921 = 10008010^2 + 4589089^2 .

It is a cyclic number.

It is not a de Polignac number, because 121220002010021 - 2¹⁰ = 121220002008997 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 121220002009978 and 121220002010005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121220002070021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610001005010 + 60610001005011.

It is an arithmetic number, because the mean of its divisors is an integer number (60610001005011).

Almost surely, 2^{121220002010021} is an apocalyptic number.

It is an amenable number.

121220002010021 is a deficient number, since it is larger than the sum of its proper divisors (1).

121220002010021 is an equidigital number, since it uses as much as digits as its factorization.

121220002010021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 121220002010021 its reverse (120010200022121), we get a palindrome (241230202032142).

The spelling of 121220002010021 in words is "one hundred twenty-one trillion, two hundred twenty billion, two million, ten thousand, twenty-one".