87031177021 has 4 divisors (see below), whose sum is σ = 87163243200. Its totient is φ = 86899110844.

The previous prime is 87031176941. The next prime is 87031177031. The reversal of 87031177021 is 12077113078.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12077113078 = 2 ⋅6038556539.

It is a cyclic number.

It is not a de Polignac number, because 87031177021 - 2¹⁵ = 87031144253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87031177031) 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, 66032101 + ... + 66033418.

It is an arithmetic number, because the mean of its divisors is an integer number (21790810800).

Almost surely, 2^87031177021 is an apocalyptic number.

It is an amenable number.

87031177021 is a deficient number, since it is larger than the sum of its proper divisors (132066179).

87031177021 is a wasteful number, since it uses less digits than its factorization.

87031177021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132066178.

The product of its (nonzero) digits is 16464, while the sum is 37.

The spelling of 87031177021 in words is "eighty-seven billion, thirty-one million, one hundred seventy-seven thousand, twenty-one".