33031020311213 has 4 divisors (see below), whose sum is σ = 33031031967900. Its totient is φ = 33031008654528.

The previous prime is 33031020311203. The next prime is 33031020311221. The reversal of 33031020311213 is 31211302013033.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 15458005398889 + 17573014912324 = 3931667^2 + 4192018^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33031020311213 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 (33031020311203) 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, 1460981 + ... + 8258117.

It is an arithmetic number, because the mean of its divisors is an integer number (8257757991975).

Almost surely, 2^{33031020311213} is an apocalyptic number.

It is an amenable number.

33031020311213 is a deficient number, since it is larger than the sum of its proper divisors (11656687).

33031020311213 is an equidigital number, since it uses as much as digits as its factorization.

33031020311213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11656686.

The product of its (nonzero) digits is 972, while the sum is 23.

Adding to 33031020311213 its reverse (31211302013033), we get a palindrome (64242322324246).

The spelling of 33031020311213 in words is "thirty-three trillion, thirty-one billion, twenty million, three hundred eleven thousand, two hundred thirteen".