12212121200 has 30 divisors (see below), whose sum is σ = 29339622144. Its totient is φ = 4884848320.

The previous prime is 12212121179. The next prime is 12212121263. The reversal of 12212121200 is 212121221.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 15264752 + ... + 15265551.

Almost surely, 2^12212121200 is an apocalyptic number.

12212121200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12212121200 is an abundant number, since it is smaller than the sum of its proper divisors (17127500944).

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

12212121200 is a wasteful number, since it uses less digits than its factorization.

12212121200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30530321 (or 30530310 counting only the distinct ones).

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

Adding to 12212121200 its reverse (212121221), we get a palindrome (12424242421).

It can be divided in two parts, 12 and 212121200, that added together give a palindrome (212121212).

The spelling of 12212121200 in words is "twelve billion, two hundred twelve million, one hundred twenty-one thousand, two hundred".