1211212200000 has 1344 divisors, whose sum is σ = 4663141539840. Its totient is φ = 274560000000.

The previous prime is 1211212199993. The next prime is 1211212200049. The reversal of 1211212200000 is 22121121.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 11992199950 + ... + 11992200050.

It is an arithmetic number, because the mean of its divisors is an integer number (3469599360).

Almost surely, 2^{1211212200000} is an apocalyptic number.

1211212200000 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 1211212200000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2331570769920).

1211212200000 is an abundant number, since it is smaller than the sum of its proper divisors (3451929339840).

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

1211212200000 is a wasteful number, since it uses less digits than its factorization.

1211212200000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254 (or 224 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1211212200000 its reverse (22121121), we get a palindrome (1211234321121).

The spelling of 1211212200000 in words is "one trillion, two hundred eleven billion, two hundred twelve million, two hundred thousand".