2102123112123 has 16 divisors (see below), whose sum is σ = 2838766089600. Its totient is φ = 1383560422080.

The previous prime is 2102123112113. The next prime is 2102123112197. The reversal of 2102123112123 is 3212113212012.

It is not a de Polignac number, because 2102123112123 - 2⁴ = 2102123112107 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2102123112123.

It is not an unprimeable number, because it can be changed into a prime (2102123112113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14006538 + ... + 14155823.

It is an arithmetic number, because the mean of its divisors is an integer number (177422880600).

Almost surely, 2^{2102123112123} is an apocalyptic number.

2102123112123 is a deficient number, since it is larger than the sum of its proper divisors (736642977477).

2102123112123 is a wasteful number, since it uses less digits than its factorization.

2102123112123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28162682.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 2102123112123 its reverse (3212113212012), we get a palindrome (5314236324135).

The spelling of 2102123112123 in words is "two trillion, one hundred two billion, one hundred twenty-three million, one hundred twelve thousand, one hundred twenty-three".