212120021200 has 30 divisors (see below), whose sum is σ = 509618351894. Its totient is φ = 84848008320.

The previous prime is 212120021159. The next prime is 212120021273. The reversal of 212120021200 is 2120021212.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 26193480336 + 185926540864 = 161844^2 + 431192^2 .

It is a congruent number.

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, 265149627 + ... + 265150426.

Almost surely, 2^212120021200 is an apocalyptic number.

212120021200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212120021200 is an abundant number, since it is smaller than the sum of its proper divisors (297498330694).

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

212120021200 is a wasteful number, since it uses less digits than its factorization.

212120021200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530300071 (or 530300060 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 212120021200 its reverse (2120021212), we get a palindrome (214240042412).

The spelling of 212120021200 in words is "two hundred twelve billion, one hundred twenty million, twenty-one thousand, two hundred".