21212200000210 has 16 divisors (see below), whose sum is σ = 38807893771992. Its totient is φ = 8345783606400.

The previous prime is 21212200000177. The next prime is 21212200000231. The reversal of 21212200000210 is 1200000221212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 16104514119849 + 5107685880361 = 4013043^2 + 2260019^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17387048571 + ... + 17387049790.

Almost surely, 2^{21212200000210} is an apocalyptic number.

21212200000210 is a deficient number, since it is larger than the sum of its proper divisors (17595693771782).

21212200000210 is a wasteful number, since it uses less digits than its factorization.

21212200000210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34774098429.

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

Adding to 21212200000210 its reverse (1200000221212), we get a palindrome (22412200221422).

The spelling of 21212200000210 in words is "twenty-one trillion, two hundred twelve billion, two hundred million, two hundred ten", and thus it is an aban number.