It is a happy number.
It is a strong prime.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-120200123 is a prime.
Almost surely, 2120200123 is an apocalyptic number.
120200123 is an equidigital number, since it uses as much as digits as its factorization.
120200123 is an evil number, because the sum of its binary digits is even.
The square root of 120200123 is about 10963.5816684148. The cubic root of 120200123 is about 493.5164546728.
Adding to 120200123 its reverse (321002021), we get a palindrome (441202144).
The spelling of 120200123 in words is "one hundred twenty million, two hundred thousand, one hundred twenty-three".