85231311386921 has 4 divisors (see below), whose sum is σ = 97407213013632. Its totient is φ = 73055409760212.

The previous prime is 85231311386803. The next prime is 85231311386939. The reversal of 85231311386921 is 12968311313258.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85231311386921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85231311389921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6087950813345 + ... + 6087950813358.

It is an arithmetic number, because the mean of its divisors is an integer number (24351803253408).

Almost surely, 2^{85231311386921} is an apocalyptic number.

It is an amenable number.

85231311386921 is a deficient number, since it is larger than the sum of its proper divisors (12175901626711).

85231311386921 is a wasteful number, since it uses less digits than its factorization.

85231311386921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12175901626710.

The product of its digits is 1866240, while the sum is 53.

The spelling of 85231311386921 in words is "eighty-five trillion, two hundred thirty-one billion, three hundred eleven million, three hundred eighty-six thousand, nine hundred twenty-one".