231221333 has 8 divisors (see below), whose sum is σ = 264346368. Its totient is φ = 198119664.

The previous prime is 231221299. The next prime is 231221381. The reversal of 231221333 is 333122132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 231221333 - 2⁸ = 231221077 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 (231221383) 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, 30260 + ... + 37122.

It is an arithmetic number, because the mean of its divisors is an integer number (33043296).

Almost surely, 2^231221333 is an apocalyptic number.

It is an amenable number.

231221333 is a deficient number, since it is larger than the sum of its proper divisors (33125035).

231221333 is an equidigital number, since it uses as much as digits as its factorization.

231221333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11683.

The product of its digits is 648, while the sum is 20.

The square root of 231221333 is about 15205.9637313786. The cubic root of 231221333 is about 613.7751487048.

Adding to 231221333 its reverse (333122132), we get a palindrome (564343465).

The spelling of 231221333 in words is "two hundred thirty-one million, two hundred twenty-one thousand, three hundred thirty-three".