211221220222221 has 32 divisors (see below), whose sum is σ = 310755297968640. Its totient is φ = 126548289672000.

The previous prime is 211221220222217. The next prime is 211221220222241. The reversal of 211221220222221 is 122222022122112.

It is a happy number.

It is not a de Polignac number, because 211221220222221 - 2² = 211221220222217 is a prime.

It is a super-2 number, since 2×211221220222221² (a number of 29 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 211221220222191 and 211221220222200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211221220222241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 47135811 + ... + 51422048.

It is an arithmetic number, because the mean of its divisors is an integer number (9711103061520).

Almost surely, 2^{211221220222221} is an apocalyptic number.

It is an amenable number.

211221220222221 is a deficient number, since it is larger than the sum of its proper divisors (99534077746419).

211221220222221 is a wasteful number, since it uses less digits than its factorization.

211221220222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98558617.

The product of its (nonzero) digits is 1024, while the sum is 24.

Adding to 211221220222221 its reverse (122222022122112), we get a palindrome (333443242344333).

The spelling of 211221220222221 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred twenty million, two hundred twenty-two thousand, two hundred twenty-one".