80871021 has 48 divisors (see below), whose sum is σ = 152066880. Its totient is φ = 42003360.

The previous prime is 80871017. The next prime is 80871029. The reversal of 80871021 is 12017808.

It is not a de Polignac number, because 80871021 - 2² = 80871017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80871029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11775 + ... + 17331.

It is an arithmetic number, because the mean of its divisors is an integer number (3168060).

Almost surely, 2^80871021 is an apocalyptic number.

It is an amenable number.

80871021 is a deficient number, since it is larger than the sum of its proper divisors (71195859).

80871021 is a wasteful number, since it uses less digits than its factorization.

80871021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5591 (or 5578 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 27.

The square root of 80871021 is about 8992.8316452606. The cubic root of 80871021 is about 432.4450948823.

Adding to 80871021 its reverse (12017808), we get a palindrome (92888829).

The spelling of 80871021 in words is "eighty million, eight hundred seventy-one thousand, twenty-one".