12221200000 has 96 divisors (see below), whose sum is σ = 30432700620. Its totient is φ = 4888320000.

The previous prime is 12221199919. The next prime is 12221200021. The reversal of 12221200000 is 212221.

It can be written as a sum of positive squares in 6 ways, for example, as 3049690176 + 9171509824 = 55224^2 + 95768^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a self number, because there is not a number n which added to its sum of digits gives 12221200000.

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, 384724 + ... + 415276.

Almost surely, 2^12221200000 is an apocalyptic number.

12221200000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12221200000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15216350310).

12221200000 is an abundant number, since it is smaller than the sum of its proper divisors (18211500620).

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

12221200000 is an frugal number, since it uses more digits than its factorization.

12221200000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30592 (or 30560 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 12221200000 its reverse (212221), we get a palindrome (12221412221).

The spelling of 12221200000 in words is "twelve billion, two hundred twenty-one million, two hundred thousand".