123120021300 has 36 divisors (see below), whose sum is σ = 356227262496. Its totient is φ = 32832005600.

The previous prime is 123120021293. The next prime is 123120021313. The reversal of 123120021300 is 3120021321.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 123120021300.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 205199736 + ... + 205200335.

It is an arithmetic number, because the mean of its divisors is an integer number (9895201736).

Almost surely, 2^123120021300 is an apocalyptic number.

123120021300 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123120021300 is an abundant number, since it is smaller than the sum of its proper divisors (233107241196).

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

123120021300 is a wasteful number, since it uses less digits than its factorization.

123120021300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410400088 (or 410400081 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 123120021300 its reverse (3120021321), we get a palindrome (126240042621).

The spelling of 123120021300 in words is "one hundred twenty-three billion, one hundred twenty million, twenty-one thousand, three hundred".