87108421 has 4 divisors (see below), whose sum is σ = 87129792. Its totient is φ = 87087052.

The previous prime is 87108353. The next prime is 87108443. The reversal of 87108421 is 12480178.

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: 12480178 = 2 ⋅6240089.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87108421 is a prime.

It is a super-2 number, since 2×87108421² = 15175754018226482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87108121) 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, 2461 + ... + 13426.

It is an arithmetic number, because the mean of its divisors is an integer number (21782448).

Almost surely, 2^87108421 is an apocalyptic number.

It is an amenable number.

87108421 is a deficient number, since it is larger than the sum of its proper divisors (21371).

87108421 is a wasteful number, since it uses less digits than its factorization.

87108421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21370.

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 87108421 is about 9333.1892191255. The cubic root of 87108421 is about 443.2887541937.

Adding to 87108421 its reverse (12480178), we get a palindrome (99588599).

The spelling of 87108421 in words is "eighty-seven million, one hundred eight thousand, four hundred twenty-one".