12121230123100 has 144 divisors (see below), whose sum is σ = 30796908871680. Its totient is φ = 4054083724800.

The previous prime is 12121230123061. The next prime is 12121230123131. The reversal of 12121230123100 is 132103212121.

It is a super-2 number, since 2×12121230123100² (a number of 27 digits) contains 22 as substring.

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 47 ways as a sum of consecutive naturals, for example, 472016061 + ... + 472041739.

It is an arithmetic number, because the mean of its divisors is an integer number (213867422720).

Almost surely, 2^{12121230123100} is an apocalyptic number.

12121230123100 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 12121230123100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15398454435840).

12121230123100 is an abundant number, since it is smaller than the sum of its proper divisors (18675678748580).

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

12121230123100 is a wasteful number, since it uses less digits than its factorization.

12121230123100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42188 (or 42181 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 12121230123100 its reverse (132103212121), we get a palindrome (12253333335221).

The spelling of 12121230123100 in words is "twelve trillion, one hundred twenty-one billion, two hundred thirty million, one hundred twenty-three thousand, one hundred".