123100123120 has 40 divisors (see below), whose sum is σ = 308223772416. Its totient is φ = 45452352768.

The previous prime is 123100123109. The next prime is 123100123129. The reversal of 123100123120 is 21321001321.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 123100123094 and 123100123103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123100123129) 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, 59181712 + ... + 59183791.

Almost surely, 2^123100123120 is an apocalyptic number.

123100123120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123100123120 is an abundant number, since it is smaller than the sum of its proper divisors (185123649296).

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

123100123120 is a wasteful number, since it uses less digits than its factorization.

123100123120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118365529 (or 118365523 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 123100123120 its reverse (21321001321), we get a palindrome (144421124441).

The spelling of 123100123120 in words is "one hundred twenty-three billion, one hundred million, one hundred twenty-three thousand, one hundred twenty".