1321241403 has 4 divisors (see below), whose sum is σ = 1761655208. Its totient is φ = 880827600.

The previous prime is 1321241333. The next prime is 1321241419. The reversal of 1321241403 is 3041421231.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1321241403 - 2¹⁰ = 1321240379 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1321241403.

It is not an unprimeable number, because it can be changed into a prime (1321241443) 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, 220206898 + ... + 220206903.

It is an arithmetic number, because the mean of its divisors is an integer number (440413802).

Almost surely, 2^1321241403 is an apocalyptic number.

1321241403 is a deficient number, since it is larger than the sum of its proper divisors (440413805).

1321241403 is an equidigital number, since it uses as much as digits as its factorization.

1321241403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440413804.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 1321241403 is about 36348.8844808200. The cubic root of 1321241403 is about 1097.3050843221.

Adding to 1321241403 its reverse (3041421231), we get a palindrome (4362662634).

It can be divided in two parts, 13212 and 41403, that added together give a triangular number (54615 = T₃₃₀).

The spelling of 1321241403 in words is "one billion, three hundred twenty-one million, two hundred forty-one thousand, four hundred three".