13221145 has 16 divisors (see below), whose sum is σ = 18240768. Its totient is φ = 9011520.

The previous prime is 13221139. The next prime is 13221149. The reversal of 13221145 is 54112231.

It is not a de Polignac number, because 13221145 - 2³ = 13221137 is a prime.

It is a super-2 number, since 2×13221145² = 349597350222050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13221149) 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 15 ways as a sum of consecutive naturals, for example, 5292 + ... + 7378.

It is an arithmetic number, because the mean of its divisors is an integer number (1140048).

Almost surely, 2^13221145 is an apocalyptic number.

It is an amenable number.

13221145 is a deficient number, since it is larger than the sum of its proper divisors (5019623).

13221145 is a wasteful number, since it uses less digits than its factorization.

13221145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2280.

The product of its digits is 240, while the sum is 19.

The square root of 13221145 is about 3636.0892453294. The cubic root of 13221145 is about 236.4592763174.

Adding to 13221145 its reverse (54112231), we get a palindrome (67333376).

It can be divided in two parts, 132211 and 45, that multiplied together give a palindrome (5949495).

The spelling of 13221145 in words is "thirteen million, two hundred twenty-one thousand, one hundred forty-five".