2121200121979 has 2 divisors, whose sum is σ = 2121200121980. Its totient is φ = 2121200121978.

The previous prime is 2121200121959. The next prime is 2121200122021. The reversal of 2121200121979 is 9791210021212.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121200121979 is a prime.

It is not a weakly prime, because it can be changed into another prime (2121200121959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060600060989 + 1060600060990.

It is an arithmetic number, because the mean of its divisors is an integer number (1060600060990).

Almost surely, 2^{2121200121979} is an apocalyptic number.

2121200121979 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121200121979 is an equidigital number, since it uses as much as digits as its factorization.

2121200121979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 37.

The spelling of 2121200121979 in words is "two trillion, one hundred twenty-one billion, two hundred million, one hundred twenty-one thousand, nine hundred seventy-nine".