85870853021 has 2 divisors, whose sum is σ = 85870853022. Its totient is φ = 85870853020.

The previous prime is 85870852993. The next prime is 85870853063. The reversal of 85870853021 is 12035807858.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45054732121 + 40816120900 = 212261^2 + 202030^2 .

It is a cyclic number.

It is not a de Polignac number, because 85870853021 - 2⁶ = 85870852957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85870853221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42935426510 + 42935426511.

It is an arithmetic number, because the mean of its divisors is an integer number (42935426511).

Almost surely, 2^85870853021 is an apocalyptic number.

It is an amenable number.

85870853021 is a deficient number, since it is larger than the sum of its proper divisors (1).

85870853021 is an equidigital number, since it uses as much as digits as its factorization.

85870853021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 537600, while the sum is 47.

The spelling of 85870853021 in words is "eighty-five billion, eight hundred seventy million, eight hundred fifty-three thousand, twenty-one".