13221143 has 4 divisors (see below), whose sum is σ = 14238168. Its totient is φ = 12204120.

The previous prime is 13221139. The next prime is 13221149. The reversal of 13221143 is 34112231.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13221143 - 2² = 13221139 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13221149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 508493 + ... + 508518.

It is an arithmetic number, because the mean of its divisors is an integer number (3559542).

Almost surely, 2^13221143 is an apocalyptic number.

13221143 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

13221143 is a deficient number, since it is larger than the sum of its proper divisors (1017025).

13221143 is a wasteful number, since it uses less digits than its factorization.

13221143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1017024.

The product of its digits is 144, while the sum is 17.

The square root of 13221143 is about 3636.0889703086. The cubic root of 13221143 is about 236.4592643942.

Adding to 13221143 its reverse (34112231), we get a palindrome (47333374).

The spelling of 13221143 in words is "thirteen million, two hundred twenty-one thousand, one hundred forty-three".