20131011010123 has 4 divisors (see below), whose sum is σ = 21679550318608. Its totient is φ = 18582471701640.

The previous prime is 20131011010057. The next prime is 20131011010127. The reversal of 20131011010123 is 32101011013102.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20131011010123 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20131011010097 and 20131011010106.

It is not an unprimeable number, because it can be changed into a prime (20131011010127) 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, 774269654223 + ... + 774269654248.

It is an arithmetic number, because the mean of its divisors is an integer number (5419887579652).

Almost surely, 2^{20131011010123} is an apocalyptic number.

20131011010123 is a deficient number, since it is larger than the sum of its proper divisors (1548539308485).

20131011010123 is a wasteful number, since it uses less digits than its factorization.

20131011010123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1548539308484.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 20131011010123 its reverse (32101011013102), we get a palindrome (52232022023225).

The spelling of 20131011010123 in words is "twenty trillion, one hundred thirty-one billion, eleven million, ten thousand, one hundred twenty-three".