1321253303 has 4 divisors (see below), whose sum is σ = 1351980168. Its totient is φ = 1290526440.

The previous prime is 1321253287. The next prime is 1321253341. The reversal of 1321253303 is 3033521231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3033521231 = 13 ⋅233347787.

It is a cyclic number.

It is not a de Polignac number, because 1321253303 - 2⁴ = 1321253287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321253383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15363368 + ... + 15363453.

It is an arithmetic number, because the mean of its divisors is an integer number (337995042).

Almost surely, 2^1321253303 is an apocalyptic number.

1321253303 is a deficient number, since it is larger than the sum of its proper divisors (30726865).

1321253303 is an equidigital number, since it uses as much as digits as its factorization.

1321253303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30726864.

The product of its (nonzero) digits is 1620, while the sum is 23.

The square root of 1321253303 is about 36349.0481718573. The cubic root of 1321253303 is about 1097.3083786712.

Adding to 1321253303 its reverse (3033521231), we get a palindrome (4354774534).

The spelling of 1321253303 in words is "one billion, three hundred twenty-one million, two hundred fifty-three thousand, three hundred three".