20111122123 has 2 divisors, whose sum is σ = 20111122124. Its totient is φ = 20111122122.

The previous prime is 20111122091. The next prime is 20111122151. The reversal of 20111122123 is 32122111102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20111122123 - 2⁵ = 20111122091 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20111122097 and 20111122106.

It is not a weakly prime, because it can be changed into another prime (20111122183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055561061 + 10055561062.

It is an arithmetic number, because the mean of its divisors is an integer number (10055561062).

Almost surely, 2^20111122123 is an apocalyptic number.

20111122123 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111122123 is an equidigital number, since it uses as much as digits as its factorization.

20111122123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 20111122123 its reverse (32122111102), we get a palindrome (52233233225).

The spelling of 20111122123 in words is "twenty billion, one hundred eleven million, one hundred twenty-two thousand, one hundred twenty-three".