12123121100 has 36 divisors (see below), whose sum is σ = 26624144904. Its totient is φ = 4790820480.

The previous prime is 12123121097. The next prime is 12123121159. The reversal of 12123121100 is 112132121.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 722009 + ... + 738608.

Almost surely, 2^12123121100 is an apocalyptic number.

12123121100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12123121100 is an abundant number, since it is smaller than the sum of its proper divisors (14501023804).

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

12123121100 is a wasteful number, since it uses less digits than its factorization.

12123121100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1460714 (or 1460707 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 12123121100 its reverse (112132121), we get a palindrome (12235253221).

The spelling of 12123121100 in words is "twelve billion, one hundred twenty-three million, one hundred twenty-one thousand, one hundred".