86704492021 has 12 divisors (see below), whose sum is σ = 100872570540. Its totient is φ = 74309114880.

The previous prime is 86704491977. The next prime is 86704492031. The reversal of 86704492021 is 12029440768.

It can be written as a sum of positive squares in 2 ways, for example, as 28938772996 + 57765719025 = 170114^2 + 240345^2 .

It is not a de Polignac number, because 86704492021 - 2¹⁷ = 86704360949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86704492031) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 317365 + ... + 523573.

It is an arithmetic number, because the mean of its divisors is an integer number (8406047545).

Almost surely, 2^86704492021 is an apocalyptic number.

It is an amenable number.

86704492021 is a deficient number, since it is larger than the sum of its proper divisors (14168078519).

86704492021 is a wasteful number, since it uses less digits than its factorization.

86704492021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214804 (or 214797 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 43.

The spelling of 86704492021 in words is "eighty-six billion, seven hundred four million, four hundred ninety-two thousand, twenty-one".