1212212211200 has 120 divisors (see below), whose sum is σ = 3039538066488. Its totient is φ = 479042478080.

The previous prime is 1212212211187. The next prime is 1212212211209. The reversal of 1212212211200 is 21122122121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212212211209) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 491894 + ... + 1632906.

Almost surely, 2^{1212212211200} is an apocalyptic number.

1212212211200 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 1212212211200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1519769033244).

1212212211200 is an abundant number, since it is smaller than the sum of its proper divisors (1827325855288).

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

1212212211200 is an equidigital number, since it uses as much as digits as its factorization.

1212212211200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1141124 (or 1141103 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1212212211200 its reverse (21122122121), we get a palindrome (1233334333321).

The spelling of 1212212211200 in words is "one trillion, two hundred twelve billion, two hundred twelve million, two hundred eleven thousand, two hundred".