2121012121979 has 2 divisors, whose sum is σ = 2121012121980. Its totient is φ = 2121012121978.

The previous prime is 2121012121951. The next prime is 2121012122071. The reversal of 2121012121979 is 9791212101212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2121012121979 - 2²⁴ = 2120995344763 is a prime.

It is not a weakly prime, because it can be changed into another prime (2121012121909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060506060989 + 1060506060990.

It is an arithmetic number, because the mean of its divisors is an integer number (1060506060990).

Almost surely, 2^{2121012121979} is an apocalyptic number.

2121012121979 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121012121979 is an equidigital number, since it uses as much as digits as its factorization.

2121012121979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 38.

The spelling of 2121012121979 in words is "two trillion, one hundred twenty-one billion, twelve million, one hundred twenty-one thousand, nine hundred seventy-nine".