13211331 has 32 divisors (see below), whose sum is σ = 21158400. Its totient is φ = 7324128.

The previous prime is 13211323. The next prime is 13211347. The reversal of 13211331 is 13311231.

13211331 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13211331 - 2³ = 13211323 is a prime.

It is a super-2 number, since 2×13211331² = 349078533583122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 13211331.

It is not an unprimeable number, because it can be changed into a prime (13211311) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37900 + ... + 38246.

It is an arithmetic number, because the mean of its divisors is an integer number (661200).

Almost surely, 2^13211331 is an apocalyptic number.

13211331 is a deficient number, since it is larger than the sum of its proper divisors (7947069).

13211331 is an equidigital number, since it uses as much as digits as its factorization.

13211331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408 (or 394 counting only the distinct ones).

The product of its digits is 54, while the sum is 15.

The square root of 13211331 is about 3634.7394679674. The cubic root of 13211331 is about 236.4007542614.

Adding to 13211331 its reverse (13311231), we get a palindrome (26522562).

The spelling of 13211331 in words is "thirteen million, two hundred eleven thousand, three hundred thirty-one".