12211221120 has 128 divisors (see below), whose sum is σ = 44483783040. Its totient is φ = 2791133184.

The previous prime is 12211221109. The next prime is 12211221151. The reversal of 12211221120 is 2112211221.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×12211221120² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 12211221120.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 440847 + ... + 467726.

It is an arithmetic number, because the mean of its divisors is an integer number (347529555).

Almost surely, 2^12211221120 is an apocalyptic number.

12211221120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12211221120 is an abundant number, since it is smaller than the sum of its proper divisors (32272561920).

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

12211221120 is an equidigital number, since it uses as much as digits as its factorization.

12211221120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 908602 (or 908590 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 12211221120 its reverse (2112211221), we get a palindrome (14323432341).

The spelling of 12211221120 in words is "twelve billion, two hundred eleven million, two hundred twenty-one thousand, one hundred twenty".