87022178521 has 4 divisors (see below), whose sum is σ = 91602293200. Its totient is φ = 82442063844.

The previous prime is 87022178497. The next prime is 87022178531. The reversal of 87022178521 is 12587122078.

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 87022178521 - 2⁵ = 87022178489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87022178531) 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, 2290057311 + ... + 2290057348.

It is an arithmetic number, because the mean of its divisors is an integer number (22900573300).

Almost surely, 2^87022178521 is an apocalyptic number.

It is an amenable number.

87022178521 is a deficient number, since it is larger than the sum of its proper divisors (4580114679).

87022178521 is a wasteful number, since it uses less digits than its factorization.

87022178521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4580114678.

The product of its (nonzero) digits is 125440, while the sum is 43.

The spelling of 87022178521 in words is "eighty-seven billion, twenty-two million, one hundred seventy-eight thousand, five hundred twenty-one".