20131243144013 has 4 divisors (see below), whose sum is σ = 20276072231520. Its totient is φ = 19986414056508.

The previous prime is 20131243143997. The next prime is 20131243144021. The reversal of 20131243144013 is 31044134213102.

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 a cyclic number.

It is not a de Polignac number, because 20131243144013 - 2⁴ = 20131243143997 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 (20131243143013) 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 3 ways as a sum of consecutive naturals, for example, 72414543545 + ... + 72414543822.

It is an arithmetic number, because the mean of its divisors is an integer number (5069018057880).

Almost surely, 2^{20131243144013} is an apocalyptic number.

It is an amenable number.

20131243144013 is a deficient number, since it is larger than the sum of its proper divisors (144829087507).

20131243144013 is a wasteful number, since it uses less digits than its factorization.

20131243144013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144829087506.

The product of its (nonzero) digits is 6912, while the sum is 29.

Adding to 20131243144013 its reverse (31044134213102), we get a palindrome (51175377357115).

The spelling of 20131243144013 in words is "twenty trillion, one hundred thirty-one billion, two hundred forty-three million, one hundred forty-four thousand, thirteen".