12222021100 has 72 divisors (see below), whose sum is σ = 27032644800. Its totient is φ = 4795022400.

The previous prime is 12222021067. The next prime is 12222021137. The reversal of 12222021100 is 112022221.

It is a happy 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, 2894791 + ... + 2899009.

It is an arithmetic number, because the mean of its divisors is an integer number (375453400).

Almost surely, 2^12222021100 is an apocalyptic number.

12222021100 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 12222021100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13516322400).

12222021100 is an abundant number, since it is smaller than the sum of its proper divisors (14810623700).

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

12222021100 is a wasteful number, since it uses less digits than its factorization.

12222021100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4783 (or 4776 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 12222021100 its reverse (112022221), we get a palindrome (12334043321).

The spelling of 12222021100 in words is "twelve billion, two hundred twenty-two million, twenty-one thousand, one hundred".