123111204100 has 18 divisors (see below), whose sum is σ = 267151313114. Its totient is φ = 49244481600.

The previous prime is 123111204079. The next prime is 123111204103. The reversal of 123111204100 is 1402111321.

It can be written as a sum of positive squares in 3 ways, for example, as 8446345216 + 114664858884 = 91904^2 + 338622^2 .

It is not an unprimeable number, because it can be changed into a prime (123111204103) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 615555921 + ... + 615556120.

Almost surely, 2^123111204100 is an apocalyptic number.

123111204100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123111204100 is an abundant number, since it is smaller than the sum of its proper divisors (144040109014).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123111204100 is a wasteful number, since it uses less digits than its factorization.

123111204100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1231112055 (or 1231112048 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 123111204100 its reverse (1402111321), we get a palindrome (124513315421).

The spelling of 123111204100 in words is "one hundred twenty-three billion, one hundred eleven million, two hundred four thousand, one hundred".