123311002123 has 4 divisors (see below), whose sum is σ = 123930655600. Its totient is φ = 122691348648.

The previous prime is 123311002099. The next prime is 123311002141. The reversal of 123311002123 is 321200113321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321200113321 = 17 ⋅18894124313.

It is a cyclic number.

It is not a de Polignac number, because 123311002123 - 2¹⁷ = 123310871051 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123311002123.

It is not an unprimeable number, because it can be changed into a prime (123311002163) 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, 309826440 + ... + 309826837.

It is an arithmetic number, because the mean of its divisors is an integer number (30982663900).

Almost surely, 2^123311002123 is an apocalyptic number.

123311002123 is a deficient number, since it is larger than the sum of its proper divisors (619653477).

123311002123 is an equidigital number, since it uses as much as digits as its factorization.

123311002123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619653476.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 123311002123 its reverse (321200113321), we get a palindrome (444511115444).

The spelling of 123311002123 in words is "one hundred twenty-three billion, three hundred eleven million, two thousand, one hundred twenty-three".