86993921021 has 4 divisors (see below), whose sum is σ = 99421624032. Its totient is φ = 74566218012.

The previous prime is 86993921011. The next prime is 86993921057. The reversal of 86993921021 is 12012939968.

It is a happy number.

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 not a de Polignac number, because 86993921021 - 2¹⁰ = 86993919997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86993921011) 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, 6213851495 + ... + 6213851508.

It is an arithmetic number, because the mean of its divisors is an integer number (24855406008).

Almost surely, 2^86993921021 is an apocalyptic number.

It is an amenable number.

86993921021 is a deficient number, since it is larger than the sum of its proper divisors (12427703011).

86993921021 is a wasteful number, since it uses less digits than its factorization.

86993921021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12427703010.

The product of its (nonzero) digits is 419904, while the sum is 50.

The spelling of 86993921021 in words is "eighty-six billion, nine hundred ninety-three million, nine hundred twenty-one thousand, twenty-one".