12221303100 has 72 divisors (see below), whose sum is σ = 35403984000. Its totient is φ = 3254988480.

The previous prime is 12221303051. The next prime is 12221303117. The reversal of 12221303100 is 130312221.

It is a super-2 number, since 2×12221303100² (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 12221303100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 222151 + ... + 271649.

It is an arithmetic number, because the mean of its divisors is an integer number (491722000).

Almost surely, 2^12221303100 is an apocalyptic number.

12221303100 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 12221303100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17701992000).

12221303100 is an abundant number, since it is smaller than the sum of its proper divisors (23182680900).

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

12221303100 is a wasteful number, since it uses less digits than its factorization.

12221303100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50339 (or 50332 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 12221303100 its reverse (130312221), we get a palindrome (12351615321).

The spelling of 12221303100 in words is "twelve billion, two hundred twenty-one million, three hundred three thousand, one hundred".