202112123 has 4 divisors (see below), whose sum is σ = 202215528. Its totient is φ = 202008720.

The previous prime is 202112117. The next prime is 202112149. The reversal of 202112123 is 321211202.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 202112123 - 2²⁴ = 185334907 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202112098 and 202112107.

It is not an unprimeable number, because it can be changed into a prime (202112153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48713 + ... + 52698.

It is an arithmetic number, because the mean of its divisors is an integer number (50553882).

Almost surely, 2^202112123 is an apocalyptic number.

202112123 is a deficient number, since it is larger than the sum of its proper divisors (103405).

202112123 is a wasteful number, since it uses less digits than its factorization.

202112123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103404.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 202112123 is about 14216.6143297200. The cubic root of 202112123 is about 586.8549714411.

Adding to 202112123 its reverse (321211202), we get a palindrome (523323325).

The spelling of 202112123 in words is "two hundred two million, one hundred twelve thousand, one hundred twenty-three".