80870028921 has 24 divisors (see below), whose sum is σ = 130395092256. Its totient is φ = 47872319040.

The previous prime is 80870028901. The next prime is 80870028929. The reversal of 80870028921 is 12982007808.

It is a happy number.

It is not a de Polignac number, because 80870028921 - 2⁷ = 80870028793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (80870028929) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9494220 + ... + 9502733.

It is an arithmetic number, because the mean of its divisors is an integer number (5433128844).

Almost surely, 2^80870028921 is an apocalyptic number.

It is an amenable number.

80870028921 is a deficient number, since it is larger than the sum of its proper divisors (49525063335).

80870028921 is a wasteful number, since it uses less digits than its factorization.

80870028921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18997013 (or 18997010 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 45.

The spelling of 80870028921 in words is "eighty billion, eight hundred seventy million, twenty-eight thousand, nine hundred twenty-one".