201223123 has 4 divisors (see below), whose sum is σ = 201254760. Its totient is φ = 201191488.

The previous prime is 201223117. The next prime is 201223157. The reversal of 201223123 is 321322102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201223123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201223097 and 201223106.

It is not an unprimeable number, because it can be changed into a prime (201223163) 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, 2590 + ... + 20227.

It is an arithmetic number, because the mean of its divisors is an integer number (50313690).

Almost surely, 2^201223123 is an apocalyptic number.

201223123 is a deficient number, since it is larger than the sum of its proper divisors (31637).

201223123 is an equidigital number, since it uses as much as digits as its factorization.

201223123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31636.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 201223123 is about 14185.3136377029. The cubic root of 201223123 is about 585.9932700831.

Adding to 201223123 its reverse (321322102), we get a palindrome (522545225).

The spelling of 201223123 in words is "two hundred one million, two hundred twenty-three thousand, one hundred twenty-three".