121212020081 has 2 divisors, whose sum is σ = 121212020082. Its totient is φ = 121212020080.

The previous prime is 121212020023. The next prime is 121212020123. The reversal of 121212020081 is 180020212121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108493819456 + 12718200625 = 329384^2 + 112775^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121212020081 is a prime.

It is a super-2 number, since 2×121212020081² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (121212020011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60606010040 + 60606010041.

It is an arithmetic number, because the mean of its divisors is an integer number (60606010041).

Almost surely, 2^121212020081 is an apocalyptic number.

It is an amenable number.

121212020081 is a deficient number, since it is larger than the sum of its proper divisors (1).

121212020081 is an equidigital number, since it uses as much as digits as its factorization.

121212020081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 20.

The spelling of 121212020081 in words is "one hundred twenty-one billion, two hundred twelve million, twenty thousand, eighty-one".