123240442099 has 4 divisors (see below), whose sum is σ = 126106498936. Its totient is φ = 120374385264.

The previous prime is 123240442079. The next prime is 123240442103. The reversal of 123240442099 is 990244042321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 990244042321 = 15319 ⋅64641559.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123240442099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123240442079) 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, 1433028354 + ... + 1433028439.

It is an arithmetic number, because the mean of its divisors is an integer number (31526624734).

Almost surely, 2^123240442099 is an apocalyptic number.

123240442099 is a deficient number, since it is larger than the sum of its proper divisors (2866056837).

123240442099 is an equidigital number, since it uses as much as digits as its factorization.

123240442099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2866056836.

The product of its (nonzero) digits is 124416, while the sum is 40.

The spelling of 123240442099 in words is "one hundred twenty-three billion, two hundred forty million, four hundred forty-two thousand, ninety-nine".