21227522 has 12 divisors (see below), whose sum is σ = 33606486. Its totient is φ = 10054800.

The previous prime is 21227513. The next prime is 21227527. The reversal of 21227522 is 22572212.

It can be written as a sum of positive squares in only one way, i.e., 20620681 + 606841 = 4541^2 + 779^2 .

It is not an unprimeable number, because it can be changed into a prime (21227527) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13979 + ... + 15422.

Almost surely, 2^21227522 is an apocalyptic number.

21227522 is a deficient number, since it is larger than the sum of its proper divisors (12378964).

21227522 is a wasteful number, since it uses less digits than its factorization.

21227522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29441 (or 29422 counting only the distinct ones).

The product of its digits is 1120, while the sum is 23.

The square root of 21227522 is about 4607.3335021463. Note that the first 3 decimals coincide. The cubic root of 21227522 is about 276.8852152930.

Adding to 21227522 its reverse (22572212), we get a palindrome (43799734).

The spelling of 21227522 in words is "twenty-one million, two hundred twenty-seven thousand, five hundred twenty-two".