22315521 has 16 divisors (see below), whose sum is σ = 30623040. Its totient is φ = 14446080.

The previous prime is 22315507. The next prime is 22315537. The reversal of 22315521 is 12551322.

It is not a de Polignac number, because 22315521 - 2¹⁰ = 22314497 is a prime.

It is a super-3 number, since 3×22315521³ (a number of 23 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22315021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51321 + ... + 51753.

It is an arithmetic number, because the mean of its divisors is an integer number (1913940).

Almost surely, 2^22315521 is an apocalyptic number.

It is an amenable number.

22315521 is a deficient number, since it is larger than the sum of its proper divisors (8307519).

22315521 is a wasteful number, since it uses less digits than its factorization.

22315521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 896.

The product of its digits is 600, while the sum is 21.

The square root of 22315521 is about 4723.9306726496. The cubic root of 22315521 is about 281.5371285973.

Adding to 22315521 its reverse (12551322), we get a palindrome (34866843).

The spelling of 22315521 in words is "twenty-two million, three hundred fifteen thousand, five hundred twenty-one".