2121012020279 has 2 divisors, whose sum is σ = 2121012020280. Its totient is φ = 2121012020278.

The previous prime is 2121012020221. The next prime is 2121012020297. The reversal of 2121012020279 is 9720202101212.

Together with next prime (2121012020297) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2121012020279 - 2¹² = 2121012016183 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121012020209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060506010139 + 1060506010140.

It is an arithmetic number, because the mean of its divisors is an integer number (1060506010140).

Almost surely, 2^{2121012020279} is an apocalyptic number.

2121012020279 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121012020279 is an equidigital number, since it uses as much as digits as its factorization.

2121012020279 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 29.

The spelling of 2121012020279 in words is "two trillion, one hundred twenty-one billion, twelve million, twenty thousand, two hundred seventy-nine".