20111444123 has 2 divisors, whose sum is σ = 20111444124. Its totient is φ = 20111444122.

The previous prime is 20111444081. The next prime is 20111444137. The reversal of 20111444123 is 32144411102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20111444123 - 2²⁸ = 19843008667 is a prime.

It is not a weakly prime, because it can be changed into another prime (20111444623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055722061 + 10055722062.

It is an arithmetic number, because the mean of its divisors is an integer number (10055722062).

Almost surely, 2^20111444123 is an apocalyptic number.

20111444123 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111444123 is an equidigital number, since it uses as much as digits as its factorization.

20111444123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 20111444123 its reverse (32144411102), we get a palindrome (52255855225).

The spelling of 20111444123 in words is "twenty billion, one hundred eleven million, four hundred forty-four thousand, one hundred twenty-three".