1212121011200 has 132 divisors (see below), whose sum is σ = 3277737821472. Its totient is φ = 440771174400.

The previous prime is 1212121011197. The next prime is 1212121011209. The reversal of 1212121011200 is 21101212121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212121011209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1870604 + ... + 2433803.

Almost surely, 2^{1212121011200} is an apocalyptic number.

1212121011200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212121011200 is an abundant number, since it is smaller than the sum of its proper divisors (2065616810272).

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

1212121011200 is a wasteful number, since it uses less digits than its factorization.

1212121011200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4304448 (or 4304425 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1212121011200 its reverse (21101212121), we get a palindrome (1233222223321).

The spelling of 1212121011200 in words is "one trillion, two hundred twelve billion, one hundred twenty-one million, eleven thousand, two hundred".