13221903 has 16 divisors (see below), whose sum is σ = 19270656. Its totient is φ = 8027520.

The previous prime is 13221881. The next prime is 13221911. The reversal of 13221903 is 30912231.

It is a happy number.

It is not a de Polignac number, because 13221903 - 2⁸ = 13221647 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13221903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13221953) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2601 + ... + 5762.

It is an arithmetic number, because the mean of its divisors is an integer number (1204416).

Almost surely, 2^13221903 is an apocalyptic number.

13221903 is a deficient number, since it is larger than the sum of its proper divisors (6048753).

13221903 is a wasteful number, since it uses less digits than its factorization.

13221903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8414.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 13221903 is about 3636.1934767006. The cubic root of 13221903 is about 236.4637951572.

The spelling of 13221903 in words is "thirteen million, two hundred twenty-one thousand, nine hundred three".