31212112213 has 8 divisors (see below), whose sum is σ = 31833795968. Its totient is φ = 30595675104.

The previous prime is 31212112159. The next prime is 31212112223. The reversal of 31212112213 is 31221121213.

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 31212112213 - 2²¹ = 31210015061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31212112223) 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, 1299645 + ... + 1323442.

It is an arithmetic number, because the mean of its divisors is an integer number (3979224496).

Almost surely, 2^31212112213 is an apocalyptic number.

It is an amenable number.

31212112213 is a deficient number, since it is larger than the sum of its proper divisors (621683755).

31212112213 is a wasteful number, since it uses less digits than its factorization.

31212112213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2623323.

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

Adding to 31212112213 its reverse (31221121213), we get a palindrome (62433233426).

The spelling of 31212112213 in words is "thirty-one billion, two hundred twelve million, one hundred twelve thousand, two hundred thirteen".