211210100211221 has 2 divisors, whose sum is σ = 211210100211222. Its totient is φ = 211210100211220.

The previous prime is 211210100211211. The next prime is 211210100211241. The reversal of 211210100211221 is 122112001012112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 141027761511121 + 70182338700100 = 11875511^2 + 8377490^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211210100211221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211210100211221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211210100211211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105605050105610 + 105605050105611.

It is an arithmetic number, because the mean of its divisors is an integer number (105605050105611).

Almost surely, 2^{211210100211221} is an apocalyptic number.

It is an amenable number.

211210100211221 is a deficient number, since it is larger than the sum of its proper divisors (1).

211210100211221 is an equidigital number, since it uses as much as digits as its factorization.

211210100211221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 211210100211221 its reverse (122112001012112), we get a palindrome (333322101223333).

The spelling of 211210100211221 in words is "two hundred eleven trillion, two hundred ten billion, one hundred million, two hundred eleven thousand, two hundred twenty-one".