12221100012 has 96 divisors (see below), whose sum is σ = 32968373760. Its totient is φ = 3482321920.

The previous prime is 12221100011. The next prime is 12221100019. The reversal of 12221100012 is 21000112221.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (12221100011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3604414 + ... + 3607802.

It is an arithmetic number, because the mean of its divisors is an integer number (343420560).

Almost surely, 2^12221100012 is an apocalyptic number.

12221100012 is a gapful number since it is divisible by the number (12) 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 12221100012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16484186880).

12221100012 is an abundant number, since it is smaller than the sum of its proper divisors (20747273748).

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

12221100012 is a wasteful number, since it uses less digits than its factorization.

12221100012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5031 (or 5029 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 12221100012 its reverse (21000112221), we get a palindrome (33221212233).

The spelling of 12221100012 in words is "twelve billion, two hundred twenty-one million, one hundred thousand, twelve".