11311311321203 has 4 divisors (see below), whose sum is σ = 11311337310048. Its totient is φ = 11311285332360.

The previous prime is 11311311321199. The next prime is 11311311321209. The reversal of 11311311321203 is 30212311311311.

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 11311311321203 - 2² = 11311311321199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11311311321209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12330251 + ... + 13215812.

It is an arithmetic number, because the mean of its divisors is an integer number (2827834327512).

Almost surely, 2^{11311311321203} is an apocalyptic number.

11311311321203 is a deficient number, since it is larger than the sum of its proper divisors (25988845).

11311311321203 is an equidigital number, since it uses as much as digits as its factorization.

11311311321203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25988844.

The product of its (nonzero) digits is 324, while the sum is 23.

Adding to 11311311321203 its reverse (30212311311311), we get a palindrome (41523622632514).

The spelling of 11311311321203 in words is "eleven trillion, three hundred eleven billion, three hundred eleven million, three hundred twenty-one thousand, two hundred three".