31113212203 has 4 divisors (see below), whose sum is σ = 31194448128. Its totient is φ = 31031976280.

The previous prime is 31113212189. The next prime is 31113212227. The reversal of 31113212203 is 30221231113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30221231113 = 31 ⋅974878423.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31113212203 is a prime.

It is a super-2 number, since 2×31113212203² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31113212293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40617388 + ... + 40618153.

It is an arithmetic number, because the mean of its divisors is an integer number (7798612032).

Almost surely, 2^31113212203 is an apocalyptic number.

31113212203 is a deficient number, since it is larger than the sum of its proper divisors (81235925).

31113212203 is an equidigital number, since it uses as much as digits as its factorization.

31113212203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81235924.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31113212203 its reverse (30221231113), we get a palindrome (61334443316).

The spelling of 31113212203 in words is "thirty-one billion, one hundred thirteen million, two hundred twelve thousand, two hundred three".