31211112222113 has 4 divisors (see below), whose sum is σ = 31278522832128. Its totient is φ = 31143701612100.

The previous prime is 31211112222091. The next prime is 31211112222137. The reversal of 31211112222113 is 31122221111213.

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.

It is a cyclic number.

It is not a de Polignac number, because 31211112222113 - 2¹² = 31211112218017 is a prime.

It is a super-2 number, since 2×31211112222113² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31211112222163) 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, 33705304313 + ... + 33705305238.

It is an arithmetic number, because the mean of its divisors is an integer number (7819630708032).

Almost surely, 2^{31211112222113} is an apocalyptic number.

It is an amenable number.

31211112222113 is a deficient number, since it is larger than the sum of its proper divisors (67410610015).

31211112222113 is an equidigital number, since it uses as much as digits as its factorization.

31211112222113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67410610014.

The product of its digits is 288, while the sum is 23.

Adding to 31211112222113 its reverse (31122221111213), we get a palindrome (62333333333326).

The spelling of 31211112222113 in words is "thirty-one trillion, two hundred eleven billion, one hundred twelve million, two hundred twenty-two thousand, one hundred thirteen".