31212311320 has 32 divisors (see below), whose sum is σ = 70872001200. Its totient is φ = 12370382208.

The previous prime is 31212311311. The next prime is 31212311327. The reversal of 31212311320 is 2311321213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31212311327) 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, 3575034 + ... + 3583753.

Almost surely, 2^31212311320 is an apocalyptic number.

It is an amenable number.

31212311320 is an abundant number, since it is smaller than the sum of its proper divisors (39659689880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31212311320 is a wasteful number, since it uses less digits than its factorization.

31212311320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7158907 (or 7158903 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31212311320 its reverse (2311321213), we get a palindrome (33523632533).

The spelling of 31212311320 in words is "thirty-one billion, two hundred twelve million, three hundred eleven thousand, three hundred twenty".