20131231134433 has 4 divisors (see below), whose sum is σ = 20136658808980. Its totient is φ = 20125803459888.

The previous prime is 20131231134419. The next prime is 20131231134473. The reversal of 20131231134433 is 33443113213102.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8741530865664 + 11389700268769 = 2956608^2 + 3374863^2 .

It is a cyclic number.

It is not a de Polignac number, because 20131231134433 - 2⁹ = 20131231133921 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20131231134395 and 20131231134404.

It is not an unprimeable number, because it can be changed into a prime (20131231134473) 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, 2713831710 + ... + 2713839127.

It is an arithmetic number, because the mean of its divisors is an integer number (5034164702245).

Almost surely, 2^{20131231134433} is an apocalyptic number.

It is an amenable number.

20131231134433 is a deficient number, since it is larger than the sum of its proper divisors (5427674547).

20131231134433 is an equidigital number, since it uses as much as digits as its factorization.

20131231134433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5427674546.

The product of its (nonzero) digits is 15552, while the sum is 31.

Adding to 20131231134433 its reverse (33443113213102), we get a palindrome (53574344347535).

The spelling of 20131231134433 in words is "twenty trillion, one hundred thirty-one billion, two hundred thirty-one million, one hundred thirty-four thousand, four hundred thirty-three".