13021403 has 4 divisors (see below), whose sum is σ = 13706760. Its totient is φ = 12336048.

The previous prime is 13021399. The next prime is 13021429. The reversal of 13021403 is 30412031.

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 13021403 - 2² = 13021399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13021433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 342650 + ... + 342687.

It is an arithmetic number, because the mean of its divisors is an integer number (3426690).

Almost surely, 2^13021403 is an apocalyptic number.

13021403 is a deficient number, since it is larger than the sum of its proper divisors (685357).

13021403 is an equidigital number, since it uses as much as digits as its factorization.

13021403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 685356.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 13021403 is about 3608.5181169006. The cubic root of 13021403 is about 235.2624380621.

Adding to 13021403 its reverse (30412031), we get a palindrome (43433434).

The spelling of 13021403 in words is "thirteen million, twenty-one thousand, four hundred three".