22521005 has 32 divisors (see below), whose sum is σ = 31298400. Its totient is φ = 15409152.

The previous prime is 22520999. The next prime is 22521041. The reversal of 22521005 is 50012522.

It can be written as a sum of positive squares in 16 ways, for example, as 3694084 + 18826921 = 1922^2 + 4339^2 .

It is a cyclic number.

It is not a de Polignac number, because 22521005 - 2⁴ = 22520989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 98231 + ... + 98459.

It is an arithmetic number, because the mean of its divisors is an integer number (978075).

Almost surely, 2^22521005 is an apocalyptic number.

It is an amenable number.

22521005 is a deficient number, since it is larger than the sum of its proper divisors (8777395).

22521005 is a wasteful number, since it uses less digits than its factorization.

22521005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353.

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 22521005 is about 4745.6300951507. The cubic root of 22521005 is about 282.3986322818.

Adding to 22521005 its reverse (50012522), we get a palindrome (72533527).

The spelling of 22521005 in words is "twenty-two million, five hundred twenty-one thousand, five".