84095587021 has 2 divisors, whose sum is σ = 84095587022. Its totient is φ = 84095587020.

The previous prime is 84095587019. The next prime is 84095587027. The reversal of 84095587021 is 12078559048.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71799882025 + 12295704996 = 267955^2 + 110886^2 .

It is a cyclic number.

It is not a de Polignac number, because 84095587021 - 2¹ = 84095587019 is a prime.

Together with 84095587019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84095587027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42047793510 + 42047793511.

It is an arithmetic number, because the mean of its divisors is an integer number (42047793511).

Almost surely, 2^84095587021 is an apocalyptic number.

It is an amenable number.

84095587021 is a deficient number, since it is larger than the sum of its proper divisors (1).

84095587021 is an equidigital number, since it uses as much as digits as its factorization.

84095587021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 806400, while the sum is 49.

The spelling of 84095587021 in words is "eighty-four billion, ninety-five million, five hundred eighty-seven thousand, twenty-one".