20311221303 has 12 divisors (see below), whose sum is σ = 29356984800. Its totient is φ = 13532250816.

The previous prime is 20311221251. The next prime is 20311221349. The reversal of 20311221303 is 30312211302.

It is not a de Polignac number, because 20311221303 - 2⁹ = 20311220791 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20311221703) 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 11 ways as a sum of consecutive naturals, for example, 698578 + ... + 727071.

It is an arithmetic number, because the mean of its divisors is an integer number (2446415400).

Almost surely, 2^20311221303 is an apocalyptic number.

20311221303 is a deficient number, since it is larger than the sum of its proper divisors (9045763497).

20311221303 is a wasteful number, since it uses less digits than its factorization.

20311221303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1427238 (or 1427235 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 20311221303 its reverse (30312211302), we get a palindrome (50623432605).

The spelling of 20311221303 in words is "twenty billion, three hundred eleven million, two hundred twenty-one thousand, three hundred three".