22216525 has 6 divisors (see below), whose sum is σ = 27548522. Its totient is φ = 17773200.

The previous prime is 22216507. The next prime is 22216531. The reversal of 22216525 is 52561222.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 3674889 + 18541636 = 1917^2 + 4306^2 .

It is a de Polignac number, because none of the positive numbers 2^k-22216525 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 888661 = 22216525 / (2 + 2 + 2 + 1 + 6 + 5 + 2 + 5).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22216525.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 444306 + ... + 444355.

Almost surely, 2^22216525 is an apocalyptic number.

22216525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

22216525 is a deficient number, since it is larger than the sum of its proper divisors (5331997).

22216525 is an equidigital number, since it uses as much as digits as its factorization.

22216525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 888671 (or 888666 counting only the distinct ones).

The product of its digits is 2400, while the sum is 25.

The square root of 22216525 is about 4713.4408875046. The cubic root of 22216525 is about 281.1201935971.

Adding to 22216525 its reverse (52561222), we get a palindrome (74777747).

The spelling of 22216525 in words is "twenty-two million, two hundred sixteen thousand, five hundred twenty-five".