1312021111403 has 4 divisors (see below), whose sum is σ = 1312176775440. Its totient is φ = 1311865447368.

The previous prime is 1312021111397. The next prime is 1312021111421. The reversal of 1312021111403 is 3041111202131.

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 1312021111403 - 2¹² = 1312021107307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1312021111003) 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, 77819375 + ... + 77836232.

It is an arithmetic number, because the mean of its divisors is an integer number (328044193860).

Almost surely, 2^{1312021111403} is an apocalyptic number.

1312021111403 is a deficient number, since it is larger than the sum of its proper divisors (155664037).

1312021111403 is an equidigital number, since it uses as much as digits as its factorization.

1312021111403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155664036.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 1312021111403 its reverse (3041111202131), we get a palindrome (4353132313534).

The spelling of 1312021111403 in words is "one trillion, three hundred twelve billion, twenty-one million, one hundred eleven thousand, four hundred three".