84008023231021 has 2 divisors, whose sum is σ = 84008023231022. Its totient is φ = 84008023231020.

The previous prime is 84008023230949. The next prime is 84008023231037. The reversal of 84008023231021 is 12013232080048.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69530081940900 + 14477941290121 = 8338470^2 + 3804989^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84008023231021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84008023231721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42004011615510 + 42004011615511.

It is an arithmetic number, because the mean of its divisors is an integer number (42004011615511).

Almost surely, 2^{84008023231021} is an apocalyptic number.

It is an amenable number.

84008023231021 is a deficient number, since it is larger than the sum of its proper divisors (1).

84008023231021 is an equidigital number, since it uses as much as digits as its factorization.

84008023231021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18432, while the sum is 34.

The spelling of 84008023231021 in words is "eighty-four trillion, eight billion, twenty-three million, two hundred thirty-one thousand, twenty-one".