2121010211977 has 2 divisors, whose sum is σ = 2121010211978. Its totient is φ = 2121010211976.

The previous prime is 2121010211921. The next prime is 2121010211987. The reversal of 2121010211977 is 7791120101212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1282501890576 + 838508321401 = 1132476^2 + 915701^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121010211977 - 2⁷ = 2121010211849 is a prime.

It is not a weakly prime, because it can be changed into another prime (2121010211987) 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, 1060505105988 + 1060505105989.

It is an arithmetic number, because the mean of its divisors is an integer number (1060505105989).

Almost surely, 2^{2121010211977} is an apocalyptic number.

It is an amenable number.

2121010211977 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121010211977 is an equidigital number, since it uses as much as digits as its factorization.

2121010211977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3528, while the sum is 34.

The spelling of 2121010211977 in words is "two trillion, one hundred twenty-one billion, ten million, two hundred eleven thousand, nine hundred seventy-seven".