1212111221200 has 240 divisors, whose sum is σ = 3213647349120. Its totient is φ = 435674880000.

The previous prime is 1212111221183. The next prime is 1212111221221. The reversal of 1212111221200 is 21221112121.

It is a super-2 number, since 2×1212111221200² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 315077677 + ... + 315081523.

It is an arithmetic number, because the mean of its divisors is an integer number (13390197288).

Almost surely, 2^{1212111221200} is an apocalyptic number.

1212111221200 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 1212111221200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1606823674560).

1212111221200 is an abundant number, since it is smaller than the sum of its proper divisors (2001536127920).

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

1212111221200 is a wasteful number, since it uses less digits than its factorization.

1212111221200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4686 (or 4675 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1212111221200 its reverse (21221112121), we get a palindrome (1233332333321).

The spelling of 1212111221200 in words is "one trillion, two hundred twelve billion, one hundred eleven million, two hundred twenty-one thousand, two hundred".