22520521 has 4 divisors (see below), whose sum is σ = 23069844. Its totient is φ = 21971200.

The previous prime is 22520513. The next prime is 22520543. The reversal of 22520521 is 12502522.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12503296 + 10017225 = 3536^2 + 3165^2 .

It is a cyclic number.

It is not a de Polignac number, because 22520521 - 2³ = 22520513 is a prime.

It is a super-2 number, since 2×22520521² = 1014347732222882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22520581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 274600 + ... + 274681.

It is an arithmetic number, because the mean of its divisors is an integer number (5767461).

Almost surely, 2^22520521 is an apocalyptic number.

It is an amenable number.

22520521 is a deficient number, since it is larger than the sum of its proper divisors (549323).

22520521 is an equidigital number, since it uses as much as digits as its factorization.

22520521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549322.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 22520521 is about 4745.5791005946. The cubic root of 22520521 is about 282.3966092532.

The spelling of 22520521 in words is "twenty-two million, five hundred twenty thousand, five hundred twenty-one".