13221131 has 24 divisors (see below), whose sum is σ = 17674560. Its totient is φ = 9752400.

The previous prime is 13221101. The next prime is 13221137. The reversal of 13221131 is 13112231.

It is a de Polignac number, because none of the positive numbers 2^k-13221131 is a prime.

It is a super-2 number, since 2×13221131² = 349596609838322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13221137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9596 + ... + 10886.

It is an arithmetic number, because the mean of its divisors is an integer number (736440).

Almost surely, 2^13221131 is an apocalyptic number.

13221131 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

13221131 is a deficient number, since it is larger than the sum of its proper divisors (4453429).

13221131 is a wasteful number, since it uses less digits than its factorization.

13221131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1335 (or 1328 counting only the distinct ones).

The product of its digits is 36, while the sum is 14.

The square root of 13221131 is about 3636.0873201836. The cubic root of 13221131 is about 236.4591928544.

Adding to 13221131 its reverse (13112231), we get a palindrome (26333362).

Subtracting from 13221131 its reverse (13112231), we obtain a square (108900 = 330²).

The spelling of 13221131 in words is "thirteen million, two hundred twenty-one thousand, one hundred thirty-one".