1212212021200 has 60 divisors (see below), whose sum is σ = 2915261442700. Its totient is φ = 484398305280.

The previous prime is 1212212021161. The next prime is 1212212021203. The reversal of 1212212021200 is 21202122121.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 210082889104 + 1002129132096 = 458348^2 + 1001064^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212212021203) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1121025 + ... + 1918624.

Almost surely, 2^{1212212021200} is an apocalyptic number.

1212212021200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212212021200 is an abundant number, since it is smaller than the sum of its proper divisors (1703049421500).

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

1212212021200 is a wasteful number, since it uses less digits than its factorization.

1212212021200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3040664 (or 3040653 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1212212021200 its reverse (21202122121), we get a palindrome (1233414143321).

The spelling of 1212212021200 in words is "one trillion, two hundred twelve billion, two hundred twelve million, twenty-one thousand, two hundred".