201020123 has 2 divisors, whose sum is σ = 201020124. Its totient is φ = 201020122.

The previous prime is 201020101. The next prime is 201020129. The reversal of 201020123 is 321020102.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 201020123 - 2¹⁰ = 201019099 is a prime.

It is not a weakly prime, because it can be changed into another prime (201020129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100510061 + 100510062.

It is an arithmetic number, because the mean of its divisors is an integer number (100510062).

Almost surely, 2^201020123 is an apocalyptic number.

201020123 is a deficient number, since it is larger than the sum of its proper divisors (1).

201020123 is an equidigital number, since it uses as much as digits as its factorization.

201020123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 201020123 is about 14178.1565444877. The cubic root of 201020123 is about 585.7961478425.

Adding to 201020123 its reverse (321020102), we get a palindrome (522040225).

The spelling of 201020123 in words is "two hundred one million, twenty thousand, one hundred twenty-three".