211210220222221 has 24 divisors (see below), whose sum is σ = 234874665418680. Its totient is φ = 189770967429120.

The previous prime is 211210220222207. The next prime is 211210220222237. The reversal of 211210220222221 is 122222022012112.

It can be written as a sum of positive squares in 4 ways, for example, as 25048373377225 + 186161846844996 = 5004835^2 + 13644114^2 .

It is a de Polignac number, because none of the positive numbers 2^k-211210220222221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211210220222192 and 211210220222201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211210220222291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17053386 + ... + 26706523.

It is an arithmetic number, because the mean of its divisors is an integer number (9786444392445).

Almost surely, 2^{211210220222221} is an apocalyptic number.

It is an amenable number.

211210220222221 is a deficient number, since it is larger than the sum of its proper divisors (23664445196459).

211210220222221 is a wasteful number, since it uses less digits than its factorization.

211210220222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43760397 (or 43760386 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 211210220222221 its reverse (122222022012112), we get a palindrome (333432242234333).

The spelling of 211210220222221 in words is "two hundred eleven trillion, two hundred ten billion, two hundred twenty million, two hundred twenty-two thousand, two hundred twenty-one".