21087325 has 24 divisors (see below), whose sum is σ = 30623040. Its totient is φ = 14102400.

The previous prime is 21087289. The next prime is 21087331. The reversal of 21087325 is 52378012.

It is not a de Polignac number, because 21087325 - 2⁷ = 21087197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21087293 and 21087302.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5706 + ... + 8644.

It is an arithmetic number, because the mean of its divisors is an integer number (1275960).

Almost surely, 2^21087325 is an apocalyptic number.

21087325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21087325 is a deficient number, since it is larger than the sum of its proper divisors (9535715).

21087325 is a wasteful number, since it uses less digits than its factorization.

21087325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2997 (or 2992 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 21087325 is about 4592.0937490430. The cubic root of 21087325 is about 276.2743063316.

It can be divided in two parts, 21087 and 325, that added together give a palindrome (21412).

The spelling of 21087325 in words is "twenty-one million, eighty-seven thousand, three hundred twenty-five".