20111031303123 has 16 divisors (see below), whose sum is σ = 27062350095872. Its totient is φ = 13284080028000.

The previous prime is 20111031303067. The next prime is 20111031303149. The reversal of 20111031303123 is 32130313011102.

It is a happy number.

It is not a de Polignac number, because 20111031303123 - 2²² = 20111027108819 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20111031303123.

It is not an unprimeable number, because it can be changed into a prime (20111031302123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68186593 + ... + 68480898.

It is an arithmetic number, because the mean of its divisors is an integer number (1691396880992).

Almost surely, 2^{20111031303123} is an apocalyptic number.

20111031303123 is a deficient number, since it is larger than the sum of its proper divisors (6951318792749).

20111031303123 is a wasteful number, since it uses less digits than its factorization.

20111031303123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136667946.

The product of its (nonzero) digits is 324, while the sum is 21.

Adding to 20111031303123 its reverse (32130313011102), we get a palindrome (52241344314225).

The spelling of 20111031303123 in words is "twenty trillion, one hundred eleven billion, thirty-one million, three hundred three thousand, one hundred twenty-three".