201123102123 has 12 divisors (see below), whose sum is σ = 303142067280. Its totient is φ = 128252412816.

The previous prime is 201123102097. The next prime is 201123102127. The reversal of 201123102123 is 321201321102.

It is not a de Polignac number, because 201123102123 - 2¹⁸ = 201122839979 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201123102096 and 201123102105.

It is not an unprimeable number, because it can be changed into a prime (201123102127) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 485804388 + ... + 485804801.

It is an arithmetic number, because the mean of its divisors is an integer number (25261838940).

Almost surely, 2^201123102123 is an apocalyptic number.

201123102123 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

201123102123 is a deficient number, since it is larger than the sum of its proper divisors (102018965157).

201123102123 is a wasteful number, since it uses less digits than its factorization.

201123102123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 971609218 (or 971609215 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 201123102123 its reverse (321201321102), we get a palindrome (522324423225).

The spelling of 201123102123 in words is "two hundred one billion, one hundred twenty-three million, one hundred two thousand, one hundred twenty-three".