31112120213 has 4 divisors (see below), whose sum is σ = 31112475168. Its totient is φ = 31111765260.

The previous prime is 31112120203. The next prime is 31112120239. The reversal of 31112120213 is 31202121113.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 31112120213 - 2⁸ = 31112119957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31112120191 and 31112120200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31112120203) 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, 59270 + ... + 256392.

It is an arithmetic number, because the mean of its divisors is an integer number (7778118792).

Almost surely, 2^31112120213 is an apocalyptic number.

It is an amenable number.

31112120213 is a deficient number, since it is larger than the sum of its proper divisors (354955).

31112120213 is a wasteful number, since it uses less digits than its factorization.

31112120213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354954.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 31112120213 its reverse (31202121113), we get a palindrome (62314241326).

The spelling of 31112120213 in words is "thirty-one billion, one hundred twelve million, one hundred twenty thousand, two hundred thirteen".