31212130330333 has 4 divisors (see below), whose sum is σ = 32055701420380. Its totient is φ = 30368559240288.

The previous prime is 31212130330307. The next prime is 31212130330349. The reversal of 31212130330333 is 33303303121213.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24116369148964 + 7095761181369 = 4910842^2 + 2663787^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31212130330333 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 (31212130333333) 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, 421785544968 + ... + 421785545041.

It is an arithmetic number, because the mean of its divisors is an integer number (8013925355095).

Almost surely, 2^{31212130330333} is an apocalyptic number.

It is an amenable number.

31212130330333 is a deficient number, since it is larger than the sum of its proper divisors (843571090047).

31212130330333 is an equidigital number, since it uses as much as digits as its factorization.

31212130330333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 843571090046.

The product of its (nonzero) digits is 8748, while the sum is 28.

Adding to 31212130330333 its reverse (33303303121213), we get a palindrome (64515433451546).

The spelling of 31212130330333 in words is "thirty-one trillion, two hundred twelve billion, one hundred thirty million, three hundred thirty thousand, three hundred thirty-three".