20231231133 has 4 divisors (see below), whose sum is σ = 26974974848. Its totient is φ = 13487487420.

The previous prime is 20231231087. The next prime is 20231231171. The reversal of 20231231133 is 33113213202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20231231133 - 2³⁴ = 3051361949 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 (20231231173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3371871853 + ... + 3371871858.

It is an arithmetic number, because the mean of its divisors is an integer number (6743743712).

Almost surely, 2^20231231133 is an apocalyptic number.

It is an amenable number.

20231231133 is a deficient number, since it is larger than the sum of its proper divisors (6743743715).

20231231133 is an equidigital number, since it uses as much as digits as its factorization.

20231231133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6743743714.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 20231231133 its reverse (33113213202), we get a palindrome (53344444335).

The spelling of 20231231133 in words is "twenty billion, two hundred thirty-one million, two hundred thirty-one thousand, one hundred thirty-three".