79812010210021 has 2 divisors, whose sum is σ = 79812010210022. Its totient is φ = 79812010210020.

The previous prime is 79812010210013. The next prime is 79812010210091. The reversal of 79812010210021 is 12001201021897.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79811174364100 + 835845921 = 8933710^2 + 28911^2 .

It is an emirp because it is prime and its reverse (12001201021897) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79812010210021 - 2³ = 79812010210013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79812010210001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39906005105010 + 39906005105011.

It is an arithmetic number, because the mean of its divisors is an integer number (39906005105011).

Almost surely, 2^{79812010210021} is an apocalyptic number.

It is an amenable number.

79812010210021 is a deficient number, since it is larger than the sum of its proper divisors (1).

79812010210021 is an equidigital number, since it uses as much as digits as its factorization.

79812010210021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 34.

The spelling of 79812010210021 in words is "seventy-nine trillion, eight hundred twelve billion, ten million, two hundred ten thousand, twenty-one".