212121212200 has 48 divisors (see below), whose sum is σ = 514624517280. Its totient is φ = 81159418560.

The previous prime is 212121212183. The next prime is 212121212209. The reversal of 212121212200 is 2212121212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (212121212209) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 23052054 + ... + 23061253.

It is an arithmetic number, because the mean of its divisors is an integer number (10721344110).

Almost surely, 2^212121212200 is an apocalyptic number.

212121212200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212121212200 is an abundant number, since it is smaller than the sum of its proper divisors (302503305080).

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

212121212200 is a wasteful number, since it uses less digits than its factorization.

212121212200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46113346 (or 46113337 counting only the distinct ones).

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

Adding to 212121212200 its reverse (2212121212), we get a palindrome (214333333412).

The spelling of 212121212200 in words is "two hundred twelve billion, one hundred twenty-one million, two hundred twelve thousand, two hundred".