231321220330133 has 32 divisors (see below), whose sum is σ = 249165240499200. Its totient is φ = 214095295411200.

The previous prime is 231321220330127. The next prime is 231321220330139. The reversal of 231321220330133 is 331033022123132.

It is an interprime number because it is at equal distance from previous prime (231321220330127) and next prime (231321220330139).

It is a cyclic number.

It is not a de Polignac number, because 231321220330133 - 2⁶ = 231321220330069 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231321220330096 and 231321220330105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231321220330139) 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, 201739868 + ... + 202883258.

It is an arithmetic number, because the mean of its divisors is an integer number (7786413765600).

Almost surely, 2^{231321220330133} is an apocalyptic number.

It is an amenable number.

231321220330133 is a deficient number, since it is larger than the sum of its proper divisors (17844020169067).

231321220330133 is a wasteful number, since it uses less digits than its factorization.

231321220330133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1144653.

The product of its (nonzero) digits is 11664, while the sum is 29.

Adding to 231321220330133 its reverse (331033022123132), we get a palindrome (562354242453265).

The spelling of 231321220330133 in words is "two hundred thirty-one trillion, three hundred twenty-one billion, two hundred twenty million, three hundred thirty thousand, one hundred thirty-three".