231021120133 has 8 divisors (see below), whose sum is σ = 232694856800. Its totient is φ = 229347551088.

The previous prime is 231021120059. The next prime is 231021120139. The reversal of 231021120133 is 331021120132.

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 231021120133 - 2³³ = 222431185541 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 231021120133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231021120139) 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, 4483963 + ... + 4535191.

It is an arithmetic number, because the mean of its divisors is an integer number (29086857100).

Almost surely, 2^231021120133 is an apocalyptic number.

It is an amenable number.

231021120133 is a deficient number, since it is larger than the sum of its proper divisors (1673736667).

231021120133 is a wasteful number, since it uses less digits than its factorization.

231021120133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83811.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 231021120133 its reverse (331021120132), we get a palindrome (562042240265).

Subtracting 231021120133 from its reverse (331021120132), we obtain a palindrome (99999999999).

The spelling of 231021120133 in words is "two hundred thirty-one billion, twenty-one million, one hundred twenty thousand, one hundred thirty-three".