311121221232203 has 4 divisors (see below), whose sum is σ = 317740821684000. Its totient is φ = 304501620780408.

The previous prime is 311121221232149. The next prime is 311121221232359. The reversal of 311121221232203 is 302232122121113.

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 311121221232203 - 2¹⁶ = 311121221166667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (311121221234203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3309800225828 + ... + 3309800225921.

It is an arithmetic number, because the mean of its divisors is an integer number (79435205421000).

Almost surely, 2^{311121221232203} is an apocalyptic number.

311121221232203 is a deficient number, since it is larger than the sum of its proper divisors (6619600451797).

311121221232203 is an equidigital number, since it uses as much as digits as its factorization.

311121221232203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6619600451796.

The product of its (nonzero) digits is 1728, while the sum is 26.

Adding to 311121221232203 its reverse (302232122121113), we get a palindrome (613353343353316).

The spelling of 311121221232203 in words is "three hundred eleven trillion, one hundred twenty-one billion, two hundred twenty-one million, two hundred thirty-two thousand, two hundred three".