123100021200 has 480 divisors, whose sum is σ = 438040713600. Its totient is φ = 29354434560.

The previous prime is 123100021147. The next prime is 123100021201. The reversal of 123100021200 is 2120001321.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123100021201) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 241846546 + ... + 241847054.

It is an arithmetic number, because the mean of its divisors is an integer number (912584820).

Almost surely, 2^123100021200 is an apocalyptic number.

123100021200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123100021200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (219020356800).

123100021200 is an abundant number, since it is smaller than the sum of its proper divisors (314940692400).

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

123100021200 is a wasteful number, since it uses less digits than its factorization.

123100021200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 999 (or 988 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 123100021200 its reverse (2120001321), we get a palindrome (125220022521).

The spelling of 123100021200 in words is "one hundred twenty-three billion, one hundred million, twenty-one thousand, two hundred".