102111201123 has 4 divisors (see below), whose sum is σ = 136148268168. Its totient is φ = 68074134080.

The previous prime is 102111201119. The next prime is 102111201139. The reversal of 102111201123 is 321102111201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321102111201 = 3 ⋅107034037067.

It is a cyclic number.

It is not a de Polignac number, because 102111201123 - 2² = 102111201119 is a prime.

It is a super-2 number, since 2×102111201123² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (102111201173) 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, 17018533518 + ... + 17018533523.

It is an arithmetic number, because the mean of its divisors is an integer number (34037067042).

Almost surely, 2^102111201123 is an apocalyptic number.

102111201123 is a deficient number, since it is larger than the sum of its proper divisors (34037067045).

102111201123 is an equidigital number, since it uses as much as digits as its factorization.

102111201123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34037067044.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 102111201123 its reverse (321102111201), we get a palindrome (423213312324).

The spelling of 102111201123 in words is "one hundred two billion, one hundred eleven million, two hundred one thousand, one hundred twenty-three".