12213121200 has 120 divisors (see below), whose sum is σ = 44711685888. Its totient is φ = 2791568640.

The previous prime is 12213121111. The next prime is 12213121211. The reversal of 12213121200 is 212131221.

It is a tau number, because it is divible by the number of its divisors (120).

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 12213121200.

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 23 ways as a sum of consecutive naturals, for example, 718572 + ... + 735371.

Almost surely, 2^12213121200 is an apocalyptic number.

12213121200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12213121200 is an abundant number, since it is smaller than the sum of its proper divisors (32498564688).

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

12213121200 is a wasteful number, since it uses less digits than its factorization.

12213121200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1453971 (or 1453960 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 12213121200 its reverse (212131221), we get a palindrome (12425252421).

The spelling of 12213121200 in words is "twelve billion, two hundred thirteen million, one hundred twenty-one thousand, two hundred".