12100221212220 has 72 divisors (see below), whose sum is σ = 36704406538800. Its totient is φ = 3226690298880.

The previous prime is 12100221212207. The next prime is 12100221212291. The reversal of 12100221212220 is 2221212200121.

It is a happy number.

12100221212220 is a `hidden beast` number, since 1 + 2 + 10 + 0 + 221 + 212 + 220 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 12100221212193 and 12100221212202.

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 23 ways as a sum of consecutive naturals, for example, 18894831 + ... + 19524729.

It is an arithmetic number, because the mean of its divisors is an integer number (509783424150).

Almost surely, 2^{12100221212220} is an apocalyptic number.

12100221212220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12100221212220 is an abundant number, since it is smaller than the sum of its proper divisors (24604185326580).

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

12100221212220 is a wasteful number, since it uses less digits than its factorization.

12100221212220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 736635 (or 736630 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 12100221212220 its reverse (2221212200121), we get a palindrome (14321433412341).

It can be divided in two parts, 1210022 and 1212220, that added together give a palindrome (2422242).

The spelling of 12100221212220 in words is "twelve trillion, one hundred billion, two hundred twenty-one million, two hundred twelve thousand, two hundred twenty".