1212212000000 has 126 divisors (see below), whose sum is σ = 3024582261414. Its totient is φ = 484883200000.

The previous prime is 1212211999991. The next prime is 1212212000047. The reversal of 1212212000000 is 2122121.

It is a happy number.

It can be written as a sum of positive squares in 7 ways, for example, as 1139838087424 + 72373912576 = 1067632^2 + 269024^2 .

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 13 ways as a sum of consecutive naturals, for example, 3848474 + ... + 4151526.

Almost surely, 2^{1212212000000} is an apocalyptic number.

1212212000000 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 1212212000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1512291130707).

1212212000000 is an abundant number, since it is smaller than the sum of its proper divisors (1812370261414).

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

1212212000000 is an frugal number, since it uses more digits than its factorization.

1212212000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303099 (or 303060 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 1212212000000 its reverse (2122121), we get a palindrome (1212214122121).

The spelling of 1212212000000 in words is "one trillion, two hundred twelve billion, two hundred twelve million", and thus it is an aban number.