12221221100 has 36 divisors (see below), whose sum is σ = 28930966008. Its totient is φ = 4444080000.

The previous prime is 12221221091. The next prime is 12221221121. The reversal of 12221221100 is 112212221.

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, 5554001 + ... + 5556200.

Almost surely, 2^12221221100 is an apocalyptic number.

12221221100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12221221100 is an abundant number, since it is smaller than the sum of its proper divisors (16709744908).

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

12221221100 is a wasteful number, since it uses less digits than its factorization.

12221221100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11110226 (or 11110219 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 12221221100 its reverse (112212221), we get a palindrome (12333433321).

The spelling of 12221221100 in words is "twelve billion, two hundred twenty-one million, two hundred twenty-one thousand, one hundred".