31213320303 has 16 divisors (see below), whose sum is σ = 45425318400. Its totient is φ = 18907111680.

The previous prime is 31213320301. The next prime is 31213320317. The reversal of 31213320303 is 30302331213.

It is not a de Polignac number, because 31213320303 - 2¹ = 31213320301 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31213320303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31213320301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 188023 + ... + 312696.

It is an arithmetic number, because the mean of its divisors is an integer number (2839082400).

Almost surely, 2^31213320303 is an apocalyptic number.

31213320303 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

31213320303 is a deficient number, since it is larger than the sum of its proper divisors (14211998097).

31213320303 is a wasteful number, since it uses less digits than its factorization.

31213320303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502622.

The product of its (nonzero) digits is 972, while the sum is 21.

Adding to 31213320303 its reverse (30302331213), we get a palindrome (61515651516).

The spelling of 31213320303 in words is "thirty-one billion, two hundred thirteen million, three hundred twenty thousand, three hundred three".