20131011311123 has 4 divisors (see below), whose sum is σ = 20142695010648. Its totient is φ = 20119327611600.

The previous prime is 20131011311069. The next prime is 20131011311161. The reversal of 20131011311123 is 32111311013102.

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 20131011311123 - 2¹⁰ = 20131011310099 is a prime.

It is a super-2 number, since 2×20131011311123² (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 = 20131011311095 and 20131011311104.

It is not an unprimeable number, because it can be changed into a prime (20131011311023) 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, 5841847178 + ... + 5841850623.

It is an arithmetic number, because the mean of its divisors is an integer number (5035673752662).

Almost surely, 2^{20131011311123} is an apocalyptic number.

20131011311123 is a deficient number, since it is larger than the sum of its proper divisors (11683699525).

20131011311123 is a wasteful number, since it uses less digits than its factorization.

20131011311123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11683699524.

The product of its (nonzero) digits is 108, while the sum is 20.

Adding to 20131011311123 its reverse (32111311013102), we get a palindrome (52242322324225).

The spelling of 20131011311123 in words is "twenty trillion, one hundred thirty-one billion, eleven million, three hundred eleven thousand, one hundred twenty-three".