231221302133 has 8 divisors (see below), whose sum is σ = 234443040000. Its totient is φ = 228018350448.

The previous prime is 231221302099. The next prime is 231221302153. The reversal of 231221302133 is 331203122132.

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 231221302133 - 2⁸ = 231221301877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231221302099 and 231221302108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231221302153) 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 7 ways as a sum of consecutive naturals, for example, 4671758 + ... + 4720991.

It is an arithmetic number, because the mean of its divisors is an integer number (29305380000).

Almost surely, 2^231221302133 is an apocalyptic number.

It is an amenable number.

231221302133 is a deficient number, since it is larger than the sum of its proper divisors (3221737867).

231221302133 is a wasteful number, since it uses less digits than its factorization.

231221302133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9393091.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 231221302133 its reverse (331203122132), we get a palindrome (562424424265).

The spelling of 231221302133 in words is "two hundred thirty-one billion, two hundred twenty-one million, three hundred two thousand, one hundred thirty-three".