20111233123 has 4 divisors (see below), whose sum is σ = 20139204960. Its totient is φ = 20083261288.

The previous prime is 20111233081. The next prime is 20111233139. The reversal of 20111233123 is 32133211102.

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 20111233123 - 2²⁹ = 19574362211 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 20111233123.

It is not an unprimeable number, because it can be changed into a prime (20111233193) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13984840 + ... + 13986277.

It is an arithmetic number, because the mean of its divisors is an integer number (5034801240).

Almost surely, 2^20111233123 is an apocalyptic number.

20111233123 is a deficient number, since it is larger than the sum of its proper divisors (27971837).

20111233123 is an equidigital number, since it uses as much as digits as its factorization.

20111233123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27971836.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 20111233123 its reverse (32133211102), we get a palindrome (52244444225).

The spelling of 20111233123 in words is "twenty billion, one hundred eleven million, two hundred thirty-three thousand, one hundred twenty-three".