12321220220 has 36 divisors (see below), whose sum is σ = 27486139800. Its totient is φ = 4638574848.

The previous prime is 12321220201. The next prime is 12321220231. The reversal of 12321220220 is 2202212321.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

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, 1060070 + ... + 1071629.

Almost surely, 2^12321220220 is an apocalyptic number.

12321220220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12321220220 is an abundant number, since it is smaller than the sum of its proper divisors (15164919580).

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

12321220220 is a wasteful number, since it uses less digits than its factorization.

12321220220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2131742 (or 2131723 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 12321220220 its reverse (2202212321), we get a palindrome (14523432541).

The spelling of 12321220220 in words is "twelve billion, three hundred twenty-one million, two hundred twenty thousand, two hundred twenty".