13721003 has 8 divisors (see below), whose sum is σ = 14208000. Its totient is φ = 13236840.

The previous prime is 13720933. The next prime is 13721033. The reversal of 13721003 is 30012731.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13721003 - 2²⁰ = 12672427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13721033) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15026 + ... + 15912.

It is an arithmetic number, because the mean of its divisors is an integer number (1776000).

Almost surely, 2^13721003 is an apocalyptic number.

13721003 is a deficient number, since it is larger than the sum of its proper divisors (486997).

13721003 is an equidigital number, since it uses as much as digits as its factorization.

13721003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1417.

The product of its (nonzero) digits is 126, while the sum is 17.

The square root of 13721003 is about 3704.1872252898. The cubic root of 13721003 is about 239.4024660860.

Adding to 13721003 its reverse (30012731), we get a palindrome (43733734).

The spelling of 13721003 in words is "thirteen million, seven hundred twenty-one thousand, three".