121210221320081 has 2 divisors, whose sum is σ = 121210221320082. Its totient is φ = 121210221320080.

The previous prime is 121210221320021. The next prime is 121210221320207. The reversal of 121210221320081 is 180023122012121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116446565863681 + 4763655456400 = 10791041^2 + 2182580^2 .

It is a cyclic number.

It is not a de Polignac number, because 121210221320081 - 2⁶ = 121210221320017 is a prime.

It is a super-2 number, since 2×121210221320081² (a number of 29 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 121210221320081.

It is not a weakly prime, because it can be changed into another prime (121210221320021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60605110660040 + 60605110660041.

It is an arithmetic number, because the mean of its divisors is an integer number (60605110660041).

Almost surely, 2^{121210221320081} is an apocalyptic number.

It is an amenable number.

121210221320081 is a deficient number, since it is larger than the sum of its proper divisors (1).

121210221320081 is an equidigital number, since it uses as much as digits as its factorization.

121210221320081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 26.

The spelling of 121210221320081 in words is "one hundred twenty-one trillion, two hundred ten billion, two hundred twenty-one million, three hundred twenty thousand, eighty-one".