22242521 has 16 divisors (see below), whose sum is σ = 27312000. Its totient is φ = 18056304.

The previous prime is 22242503. The next prime is 22242533. The reversal of 22242521 is 12524222.

It is not a de Polignac number, because 22242521 - 2¹⁴ = 22226137 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22242493 and 22242502.

It is not an unprimeable number, because it can be changed into a prime (22242721) 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 15 ways as a sum of consecutive naturals, for example, 4811 + ... + 8223.

It is an arithmetic number, because the mean of its divisors is an integer number (1707000).

Almost surely, 2^22242521 is an apocalyptic number.

It is an amenable number.

22242521 is a deficient number, since it is larger than the sum of its proper divisors (5069479).

22242521 is an equidigital number, since it uses as much as digits as its factorization.

22242521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3453 (or 3439 counting only the distinct ones).

The product of its digits is 640, while the sum is 20.

The square root of 22242521 is about 4716.1977269830. The cubic root of 22242521 is about 281.2297989771.

Adding to 22242521 its reverse (12524222), we get a palindrome (34766743).

The spelling of 22242521 in words is "twenty-two million, two hundred forty-two thousand, five hundred twenty-one".