13221045 has 24 divisors (see below), whose sum is σ = 23212800. Its totient is φ = 6960096.

The previous prime is 13221037. The next prime is 13221059. The reversal of 13221045 is 54012231.

It is not a de Polignac number, because 13221045 - 2³ = 13221037 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, 1696 + ... + 5414.

It is an arithmetic number, because the mean of its divisors is an integer number (967200).

Almost surely, 2^13221045 is an apocalyptic number.

13221045 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13221045 is a deficient number, since it is larger than the sum of its proper divisors (9991755).

13221045 is a wasteful number, since it uses less digits than its factorization.

13221045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3809 (or 3806 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 13221045 is about 3636.0754942658. The cubic root of 13221045 is about 236.4586801516.

Adding to 13221045 its reverse (54012231), we get a palindrome (67233276).

The spelling of 13221045 in words is "thirteen million, two hundred twenty-one thousand, forty-five".