21212200000209 has 8 divisors (see below), whose sum is σ = 29258206896960. Its totient is φ = 13653829885136.

The previous prime is 21212200000177. The next prime is 21212200000231. The reversal of 21212200000209 is 90200000221212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21212200000209 - 2⁵ = 21212200000177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21212200000289) by changing a digit.

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, 121909195317 + ... + 121909195490.

It is an arithmetic number, because the mean of its divisors is an integer number (3657275862120).

Almost surely, 2^{21212200000209} is an apocalyptic number.

21212200000209 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

21212200000209 is a deficient number, since it is larger than the sum of its proper divisors (8046006896751).

21212200000209 is a wasteful number, since it uses less digits than its factorization.

21212200000209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243818390839.

The product of its (nonzero) digits is 288, while the sum is 21.

The spelling of 21212200000209 in words is "twenty-one trillion, two hundred twelve billion, two hundred million, two hundred nine", and thus it is an aban number.