31321212113 has 16 divisors (see below), whose sum is σ = 33826913280. Its totient is φ = 28911871296.

The previous prime is 31321212107. The next prime is 31321212121. The reversal of 31321212113 is 31121212313.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31321212113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31321212103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1461431 + ... + 1482707.

It is an arithmetic number, because the mean of its divisors is an integer number (2114182080).

Almost surely, 2^31321212113 is an apocalyptic number.

It is an amenable number.

31321212113 is a deficient number, since it is larger than the sum of its proper divisors (2505701167).

31321212113 is a wasteful number, since it uses less digits than its factorization.

31321212113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23536.

The product of its digits is 216, while the sum is 20.

Adding to 31321212113 its reverse (31121212313), we get a palindrome (62442424426).

The spelling of 31321212113 in words is "thirty-one billion, three hundred twenty-one million, two hundred twelve thousand, one hundred thirteen".