13121403 has 4 divisors (see below), whose sum is σ = 17495208. Its totient is φ = 8747600.

The previous prime is 13121371. The next prime is 13121411. The reversal of 13121403 is 30412131.

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 13121403 - 2⁵ = 13121371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13121453) 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, 2186898 + ... + 2186903.

It is an arithmetic number, because the mean of its divisors is an integer number (4373802).

Almost surely, 2^13121403 is an apocalyptic number.

13121403 is a deficient number, since it is larger than the sum of its proper divisors (4373805).

13121403 is an equidigital number, since it uses as much as digits as its factorization.

13121403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4373804.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 13121403 is about 3622.3477193665. The cubic root of 13121403 is about 235.8631484181.

Adding to 13121403 its reverse (30412131), we get a palindrome (43533534).

The spelling of 13121403 in words is "thirteen million, one hundred twenty-one thousand, four hundred three".