20131330031231 has 4 divisors (see below), whose sum is σ = 20131369132632. Its totient is φ = 20131290929832.

The previous prime is 20131330031167. The next prime is 20131330031243. The reversal of 20131330031231 is 13213003313102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20131330031231 - 2⁶ = 20131330031167 is a prime.

It is a super-2 number, since 2×20131330031231² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20131330031197 and 20131330031206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20131330031291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18767981 + ... + 19811606.

It is an arithmetic number, because the mean of its divisors is an integer number (5032842283158).

Almost surely, 2^{20131330031231} is an apocalyptic number.

20131330031231 is a deficient number, since it is larger than the sum of its proper divisors (39101401).

20131330031231 is an equidigital number, since it uses as much as digits as its factorization.

20131330031231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39101400.

The product of its (nonzero) digits is 972, while the sum is 23.

Adding to 20131330031231 its reverse (13213003313102), we get a palindrome (33344333344333).

The spelling of 20131330031231 in words is "twenty trillion, one hundred thirty-one billion, three hundred thirty million, thirty-one thousand, two hundred thirty-one".