20131231012123 has 12 divisors (see below), whose sum is σ = 25546868298072. Its totient is φ = 15686673515520.

The previous prime is 20131231012111. The next prime is 20131231012229. The reversal of 20131231012123 is 32121013213102.

It is not a de Polignac number, because 20131231012123 - 2⁹ = 20131231011611 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20131231012094 and 20131231012103.

It is not an unprimeable number, because it can be changed into a prime (20131231072123) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18674610790 + ... + 18674611867.

It is an arithmetic number, because the mean of its divisors is an integer number (2128905691506).

Almost surely, 2^{20131231012123} is an apocalyptic number.

20131231012123 is a deficient number, since it is larger than the sum of its proper divisors (5415637285949).

20131231012123 is a wasteful number, since it uses less digits than its factorization.

20131231012123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37349222682 (or 37349222675 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 20131231012123 its reverse (32121013213102), we get a palindrome (52252244225225).

The spelling of 20131231012123 in words is "twenty trillion, one hundred thirty-one billion, two hundred thirty-one million, twelve thousand, one hundred twenty-three".