12321021100 has 18 divisors (see below), whose sum is σ = 26736616004. Its totient is φ = 4928408400.

The previous prime is 12321021059. The next prime is 12321021109. The reversal of 12321021100 is 112012321.

It is not an unprimeable number, because it can be changed into a prime (12321021109) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 61605006 + ... + 61605205.

Almost surely, 2^12321021100 is an apocalyptic number.

12321021100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12321021100 is an abundant number, since it is smaller than the sum of its proper divisors (14415594904).

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

12321021100 is a wasteful number, since it uses less digits than its factorization.

12321021100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123210225 (or 123210218 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 12321021100 its reverse (112012321), we get a palindrome (12433033421).

The spelling of 12321021100 in words is "twelve billion, three hundred twenty-one million, twenty-one thousand, one hundred".