12120221100 has 72 divisors (see below), whose sum is σ = 37765378000. Its totient is φ = 2983438080.

The previous prime is 12120221039. The next prime is 12120221117. The reversal of 12120221100 is 112202121.

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

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 23 ways as a sum of consecutive naturals, for example, 1549975 + ... + 1557774.

Almost surely, 2^12120221100 is an apocalyptic number.

12120221100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12120221100 is an abundant number, since it is smaller than the sum of its proper divisors (25645156900).

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

12120221100 is a wasteful number, since it uses less digits than its factorization.

12120221100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3107779 (or 3107772 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 12120221100 its reverse (112202121), we get a palindrome (12232423221).

The spelling of 12120221100 in words is "twelve billion, one hundred twenty million, two hundred twenty-one thousand, one hundred".