22521087 has 6 divisors (see below), whose sum is σ = 32530472. Its totient is φ = 15014052.

The previous prime is 22521041. The next prime is 22521089. The reversal of 22521087 is 78012522.

It is not a de Polignac number, because 22521087 - 2⁷ = 22520959 is a prime.

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 22521087.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22521089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1251163 + ... + 1251180.

Almost surely, 2^22521087 is an apocalyptic number.

22521087 is a deficient number, since it is larger than the sum of its proper divisors (10009385).

22521087 is a wasteful number, since it uses less digits than its factorization.

22521087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2502349 (or 2502346 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 22521087 is about 4745.6387346700. The cubic root of 22521087 is about 282.3989750235.

It can be divided in two parts, 225 and 21087, that added together give a palindrome (21312).

The spelling of 22521087 in words is "twenty-two million, five hundred twenty-one thousand, eighty-seven".