85870853221 has 2 divisors, whose sum is σ = 85870853222. Its totient is φ = 85870853220.

The previous prime is 85870853177. The next prime is 85870853261. The reversal of 85870853221 is 12235807858.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78562484100 + 7308369121 = 280290^2 + 85489^2 .

It is a cyclic number.

It is not a de Polignac number, because 85870853221 - 2¹¹ = 85870851173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85870853261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42935426610 + 42935426611.

It is an arithmetic number, because the mean of its divisors is an integer number (42935426611).

Almost surely, 2^85870853221 is an apocalyptic number.

It is an amenable number.

85870853221 is a deficient number, since it is larger than the sum of its proper divisors (1).

85870853221 is an equidigital number, since it uses as much as digits as its factorization.

85870853221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1075200, while the sum is 49.

The spelling of 85870853221 in words is "eighty-five billion, eight hundred seventy million, eight hundred fifty-three thousand, two hundred twenty-one".