22521523 has 2 divisors, whose sum is σ = 22521524. Its totient is φ = 22521522.

The previous prime is 22521511. The next prime is 22521529. The reversal of 22521523 is 32512522.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22521523 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22521494 and 22521503.

It is not a weakly prime, because it can be changed into another prime (22521529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11260761 + 11260762.

It is an arithmetic number, because the mean of its divisors is an integer number (11260762).

Almost surely, 2^22521523 is an apocalyptic number.

22521523 is a deficient number, since it is larger than the sum of its proper divisors (1).

22521523 is an equidigital number, since it uses as much as digits as its factorization.

22521523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1200, while the sum is 22.

The square root of 22521523 is about 4745.6846713620. The cubic root of 22521523 is about 282.4007973920.

Subtracting 22521523 from its reverse (32512522), we obtain a palindrome (9990999).

The spelling of 22521523 in words is "twenty-two million, five hundred twenty-one thousand, five hundred twenty-three".