121220210021081 has 2 divisors, whose sum is σ = 121220210021082. Its totient is φ = 121220210021080.

The previous prime is 121220210021063. The next prime is 121220210021101. The reversal of 121220210021081 is 180120012022121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120488842981081 + 731367040000 = 10976741^2 + 855200^2 .

It is a cyclic number.

It is not a de Polignac number, because 121220210021081 - 2⁶ = 121220210021017 is a prime.

It is a super-2 number, since 2×121220210021081² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (121220210041081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610105010540 + 60610105010541.

It is an arithmetic number, because the mean of its divisors is an integer number (60610105010541).

Almost surely, 2^{121220210021081} is an apocalyptic number.

It is an amenable number.

121220210021081 is a deficient number, since it is larger than the sum of its proper divisors (1).

121220210021081 is an equidigital number, since it uses as much as digits as its factorization.

121220210021081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 23.

The spelling of 121220210021081 in words is "one hundred twenty-one trillion, two hundred twenty billion, two hundred ten million, twenty-one thousand, eighty-one".