1212221211200 has 84 divisors (see below), whose sum is σ = 2983252379940. Its totient is φ = 484818493440.

The previous prime is 1212221211197. The next prime is 1212221211263. The reversal of 1212221211200 is 21121222121.

It can be written as a sum of positive squares in 6 ways, for example, as 39782695936 + 1172438515264 = 199456^2 + 1082792^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11841836 + ... + 11943764.

It is an arithmetic number, because the mean of its divisors is an integer number (35514909285).

Almost surely, 2^{1212221211200} is an apocalyptic number.

1212221211200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212221211200 is an abundant number, since it is smaller than the sum of its proper divisors (1771031168740).

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

1212221211200 is a wasteful number, since it uses less digits than its factorization.

1212221211200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109384 (or 109369 counting only the distinct ones).

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

Adding to 1212221211200 its reverse (21121222121), we get a palindrome (1233342433321).

The spelling of 1212221211200 in words is "one trillion, two hundred twelve billion, two hundred twenty-one million, two hundred eleven thousand, two hundred".