7902112210021 has 2 divisors, whose sum is σ = 7902112210022. Its totient is φ = 7902112210020.

The previous prime is 7902112210007. The next prime is 7902112210127. The reversal of 7902112210021 is 1200122112097.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7660550772900 + 241561437121 = 2767770^2 + 491489^2 .

It is an emirp because it is prime and its reverse (1200122112097) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7902112210021 - 2¹⁹ = 7902111685733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7902112210721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3951056105010 + 3951056105011.

It is an arithmetic number, because the mean of its divisors is an integer number (3951056105011).

Almost surely, 2^{7902112210021} is an apocalyptic number.

It is an amenable number.

7902112210021 is a deficient number, since it is larger than the sum of its proper divisors (1).

7902112210021 is an equidigital number, since it uses as much as digits as its factorization.

7902112210021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 28.

The spelling of 7902112210021 in words is "seven trillion, nine hundred two billion, one hundred twelve million, two hundred ten thousand, twenty-one".