22400521 has 16 divisors (see below), whose sum is σ = 26449920. Its totient is φ = 18702720.

The previous prime is 22400513. The next prime is 22400527. The reversal of 22400521 is 12500422.

It is a cyclic number.

It is not a de Polignac number, because 22400521 - 2³ = 22400513 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22400495 and 22400504.

It is not an unprimeable number, because it can be changed into a prime (22400527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54565 + ... + 54973.

It is an arithmetic number, because the mean of its divisors is an integer number (1653120).

Almost surely, 2^22400521 is an apocalyptic number.

It is an amenable number.

22400521 is a deficient number, since it is larger than the sum of its proper divisors (4049399).

22400521 is a wasteful number, since it uses less digits than its factorization.

22400521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 816.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 22400521 is about 4732.9188668305. The cubic root of 22400521 is about 281.8941347672.

Adding to 22400521 its reverse (12500422), we get a palindrome (34900943).

Subtracting from 22400521 its reverse (12500422), we obtain a palindrome (9900099).

The spelling of 22400521 in words is "twenty-two million, four hundred thousand, five hundred twenty-one".