231221213333 has 32 divisors (see below), whose sum is σ = 258613834752. Its totient is φ = 204971267200.

The previous prime is 231221213287. The next prime is 231221213339. The reversal of 231221213333 is 333312122132.

It is a cyclic number.

It is not a de Polignac number, because 231221213333 - 2¹² = 231221209237 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 (231221213339) 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 31 ways as a sum of consecutive naturals, for example, 27446960 + ... + 27455382.

It is an arithmetic number, because the mean of its divisors is an integer number (8081682336).

Almost surely, 2^231221213333 is an apocalyptic number.

It is an amenable number.

231221213333 is a deficient number, since it is larger than the sum of its proper divisors (27392621419).

231221213333 is a wasteful number, since it uses less digits than its factorization.

231221213333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8905.

The product of its digits is 3888, while the sum is 26.

Adding to 231221213333 its reverse (333312122132), we get a palindrome (564533335465).

The spelling of 231221213333 in words is "two hundred thirty-one billion, two hundred twenty-one million, two hundred thirteen thousand, three hundred thirty-three".