13221051 has 4 divisors (see below), whose sum is σ = 17628072. Its totient is φ = 8814032.

The previous prime is 13221037. The next prime is 13221059. The reversal of 13221051 is 15012231.

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 13221051 - 2¹⁵ = 13188283 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13221051.

It is not an unprimeable number, because it can be changed into a prime (13221059) 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, 2203506 + ... + 2203511.

It is an arithmetic number, because the mean of its divisors is an integer number (4407018).

Almost surely, 2^13221051 is an apocalyptic number.

13221051 is a deficient number, since it is larger than the sum of its proper divisors (4407021).

13221051 is an equidigital number, since it uses as much as digits as its factorization.

13221051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4407020.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 13221051 is about 3636.0763193310. The cubic root of 13221051 is about 236.4587159216.

Adding to 13221051 its reverse (15012231), we get a palindrome (28233282).

The spelling of 13221051 in words is "thirteen million, two hundred twenty-one thousand, fifty-one".