1212100211200 has 60 divisors (see below), whose sum is σ = 3003073000290. Its totient is φ = 484840079360.

The previous prime is 1212100211197. The next prime is 1212100211219. The reversal of 1212100211200 is 21120012121.

It can be written as a sum of positive squares in 3 ways, for example, as 669438148864 + 542662062336 = 818192^2 + 736656^2 .

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 5 ways as a sum of consecutive naturals, for example, 47334865 + ... + 47360464.

Almost surely, 2^{1212100211200} is an apocalyptic number.

1212100211200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212100211200 is an abundant number, since it is smaller than the sum of its proper divisors (1790972789090).

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

1212100211200 is an frugal number, since it uses more digits than its factorization.

1212100211200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94695357 (or 94695336 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1212100211200 its reverse (21120012121), we get a palindrome (1233220223321).

The spelling of 1212100211200 in words is "one trillion, two hundred twelve billion, one hundred million, two hundred eleven thousand, two hundred".