31213220303 has 4 divisors (see below), whose sum is σ = 31215459240. Its totient is φ = 31210981368.

The previous prime is 31213220299. The next prime is 31213220309. The reversal of 31213220303 is 30302231213.

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 31213220303 - 2² = 31213220299 is a prime.

It is a super-2 number, since 2×31213220303² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31213220309) 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, 1098425 + ... + 1126482.

It is an arithmetic number, because the mean of its divisors is an integer number (7803864810).

Almost surely, 2^31213220303 is an apocalyptic number.

31213220303 is a deficient number, since it is larger than the sum of its proper divisors (2238937).

31213220303 is a wasteful number, since it uses less digits than its factorization.

31213220303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2238936.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 31213220303 its reverse (30302231213), we get a palindrome (61515451516).

The spelling of 31213220303 in words is "thirty-one billion, two hundred thirteen million, two hundred twenty thousand, three hundred three".