123111213209 has 8 divisors (see below), whose sum is σ = 123373539072. Its totient is φ = 122848958080.

The previous prime is 123111213193. The next prime is 123111213227. The reversal of 123111213209 is 902312111321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 123111213209 - 2⁴ = 123111213193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123111213259) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4888169 + ... + 4913289.

It is an arithmetic number, because the mean of its divisors is an integer number (15421692384).

Almost surely, 2^123111213209 is an apocalyptic number.

It is an amenable number.

123111213209 is a deficient number, since it is larger than the sum of its proper divisors (262325863).

123111213209 is an equidigital number, since it uses as much as digits as its factorization.

123111213209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35367.

The product of its (nonzero) digits is 648, while the sum is 26.

The spelling of 123111213209 in words is "one hundred twenty-three billion, one hundred eleven million, two hundred thirteen thousand, two hundred nine".