31200212012213 has 4 divisors (see below), whose sum is σ = 31521863682540. Its totient is φ = 30878560341888.

The previous prime is 31200212012197. The next prime is 31200212012227. The reversal of 31200212012213 is 31221021200213.

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 25526321360164 + 5673890652049 = 5052358^2 + 2381993^2 .

It is a cyclic number.

It is not a de Polignac number, because 31200212012213 - 2⁴ = 31200212012197 is a prime.

It is a super-2 number, since 2×31200212012213² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31200212017213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160825835018 + ... + 160825835211.

It is an arithmetic number, because the mean of its divisors is an integer number (7880465920635).

Almost surely, 2^{31200212012213} is an apocalyptic number.

It is an amenable number.

31200212012213 is a deficient number, since it is larger than the sum of its proper divisors (321651670327).

31200212012213 is an equidigital number, since it uses as much as digits as its factorization.

31200212012213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321651670326.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 31200212012213 its reverse (31221021200213), we get a palindrome (62421233212426).

The spelling of 31200212012213 in words is "thirty-one trillion, two hundred billion, two hundred twelve million, twelve thousand, two hundred thirteen".