31212212113 has 8 divisors (see below), whose sum is σ = 31374475200. Its totient is φ = 31050003600.

The previous prime is 31212212089. The next prime is 31212212131. The reversal of 31212212113 is 31121221213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31212212113 - 2¹³ = 31212203921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31212212183) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1659663 + ... + 1678363.

It is an arithmetic number, because the mean of its divisors is an integer number (3921809400).

Almost surely, 2^31212212113 is an apocalyptic number.

It is an amenable number.

31212212113 is a deficient number, since it is larger than the sum of its proper divisors (162263087).

31212212113 is a wasteful number, since it uses less digits than its factorization.

31212212113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27287.

The product of its digits is 144, while the sum is 19.

Adding to 31212212113 its reverse (31121221213), we get a palindrome (62333433326).

The spelling of 31212212113 in words is "thirty-one billion, two hundred twelve million, two hundred twelve thousand, one hundred thirteen".