87253221 has 24 divisors (see below), whose sum is σ = 128773792. Its totient is φ = 52509600.

The previous prime is 87253217. The next prime is 87253247. The reversal of 87253221 is 12235278.

It is not a de Polignac number, because 87253221 - 2² = 87253217 is a prime.

It is a super-2 number, since 2×87253221² = 15226249149749682, which contains 22 as substring.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87251221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 56226 + ... + 57756.

Almost surely, 2^87253221 is an apocalyptic number.

It is an amenable number.

87253221 is a deficient number, since it is larger than the sum of its proper divisors (41520571).

87253221 is a wasteful number, since it uses less digits than its factorization.

87253221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1713 (or 1702 counting only the distinct ones).

The product of its digits is 6720, while the sum is 30.

The square root of 87253221 is about 9340.9432607205. The cubic root of 87253221 is about 443.5342439602.

Adding to 87253221 its reverse (12235278), we get a palindrome (99488499).

The spelling of 87253221 in words is "eighty-seven million, two hundred fifty-three thousand, two hundred twenty-one".