31213223303 has 4 divisors (see below), whose sum is σ = 33049295280. Its totient is φ = 29377151328.

The previous prime is 31213223299. The next prime is 31213223357. The reversal of 31213223303 is 30332231213.

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 31213223303 - 2² = 31213223299 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31213223003) 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, 918035963 + ... + 918035996.

It is an arithmetic number, because the mean of its divisors is an integer number (8262323820).

Almost surely, 2^31213223303 is an apocalyptic number.

31213223303 is a deficient number, since it is larger than the sum of its proper divisors (1836071977).

31213223303 is a wasteful number, since it uses less digits than its factorization.

31213223303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1836071976.

The product of its (nonzero) digits is 1944, while the sum is 23.

Adding to 31213223303 its reverse (30332231213), we get a palindrome (61545454516).

The spelling of 31213223303 in words is "thirty-one billion, two hundred thirteen million, two hundred twenty-three thousand, three hundred three".