21012102122279 has 2 divisors, whose sum is σ = 21012102122280. Its totient is φ = 21012102122278.

The previous prime is 21012102122173. The next prime is 21012102122299. The reversal of 21012102122279 is 97222120121012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21012102122279 - 2²⁰ = 21012101073703 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21012102122299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506051061139 + 10506051061140.

It is an arithmetic number, because the mean of its divisors is an integer number (10506051061140).

Almost surely, 2^{21012102122279} is an apocalyptic number.

21012102122279 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012102122279 is an equidigital number, since it uses as much as digits as its factorization.

21012102122279 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 32.

The spelling of 21012102122279 in words is "twenty-one trillion, twelve billion, one hundred two million, one hundred twenty-two thousand, two hundred seventy-nine".