22503221 has 8 divisors (see below), whose sum is σ = 24362520. Its totient is φ = 20662272.

The previous prime is 22503211. The next prime is 22503227. The reversal of 22503221 is 12230522.

It can be written as a sum of positive squares in 4 ways, for example, as 130321 + 22372900 = 361^2 + 4730^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22503221 - 2¹⁰ = 22502197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22503221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22503227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1976 + ... + 6993.

It is an arithmetic number, because the mean of its divisors is an integer number (3045315).

Almost surely, 2^22503221 is an apocalyptic number.

It is an amenable number.

22503221 is a deficient number, since it is larger than the sum of its proper divisors (1859299).

22503221 is a wasteful number, since it uses less digits than its factorization.

22503221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9175.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 22503221 is about 4743.7560013137. The cubic root of 22503221 is about 282.3242794751.

Adding to 22503221 its reverse (12230522), we get a palindrome (34733743).

The spelling of 22503221 in words is "twenty-two million, five hundred three thousand, two hundred twenty-one".