87116221 has 4 divisors (see below), whose sum is σ = 87379744. Its totient is φ = 86852700.

The previous prime is 87116207. The next prime is 87116233. The reversal of 87116221 is 12261178.

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 87116221 - 2⁵ = 87116189 is a prime.

It is a super-2 number, since 2×87116221² = 15178471922641682, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 87116221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87116251) 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, 131265 + ... + 131926.

It is an arithmetic number, because the mean of its divisors is an integer number (21844936).

Almost surely, 2^87116221 is an apocalyptic number.

It is an amenable number.

87116221 is a deficient number, since it is larger than the sum of its proper divisors (263523).

87116221 is a wasteful number, since it uses less digits than its factorization.

87116221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263522.

The product of its digits is 1344, while the sum is 28.

The square root of 87116221 is about 9333.6070733667. The cubic root of 87116221 is about 443.3019850197.

Adding to 87116221 its reverse (12261178), we get a palindrome (99377399).

The spelling of 87116221 in words is "eighty-seven million, one hundred sixteen thousand, two hundred twenty-one".