211222221212221 has 12 divisors (see below), whose sum is σ = 217298527536832. Its totient is φ = 205310051676000.

The previous prime is 211222221212203. The next prime is 211222221212243. The reversal of 211222221212221 is 122212122222112.

It is not a de Polignac number, because 211222221212221 - 2¹¹ = 211222221210173 is a prime.

It is a super-2 number, since 2×211222221212221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211222221212921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 231376035 + ... + 232287136.

Almost surely, 2^{211222221212221} is an apocalyptic number.

It is an amenable number.

211222221212221 is a deficient number, since it is larger than the sum of its proper divisors (6076306324611).

211222221212221 is an equidigital number, since it uses as much as digits as its factorization.

211222221212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463663524 (or 463663483 counting only the distinct ones).

The product of its digits is 1024, while the sum is 25.

Adding to 211222221212221 its reverse (122212122222112), we get a palindrome (333434343434333).

The spelling of 211222221212221 in words is "two hundred eleven trillion, two hundred twenty-two billion, two hundred twenty-one million, two hundred twelve thousand, two hundred twenty-one".