13221525 has 24 divisors (see below), whose sum is σ = 22007520. Its totient is φ = 7003840.

The previous prime is 13221503. The next prime is 13221553. The reversal of 13221525 is 52512231.

It is not a de Polignac number, because 13221525 - 2⁵ = 13221493 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12466 + ... + 13484.

It is an arithmetic number, because the mean of its divisors is an integer number (916980).

Almost surely, 2^13221525 is an apocalyptic number.

13221525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13221525 is a deficient number, since it is larger than the sum of its proper divisors (8785995).

13221525 is a wasteful number, since it uses less digits than its factorization.

13221525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1205 (or 1200 counting only the distinct ones).

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

The square root of 13221525 is about 3636.1414988969. The cubic root of 13221525 is about 236.4615417204.

Adding to 13221525 its reverse (52512231), we get a palindrome (65733756).

The spelling of 13221525 in words is "thirteen million, two hundred twenty-one thousand, five hundred twenty-five".