211222221222221 has 4 divisors (see below), whose sum is σ = 230424241333344. Its totient is φ = 192020201111100.

The previous prime is 211222221222217. The next prime is 211222221222293. The reversal of 211222221222221 is 122222122222112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 211222221222221 - 2² = 211222221222217 is a prime.

It is a super-2 number, since 2×211222221222221² (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 (211222221722221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9601010055545 + ... + 9601010055566.

It is an arithmetic number, because the mean of its divisors is an integer number (57606060333336).

Almost surely, 2^{211222221222221} is an apocalyptic number.

It is an amenable number.

211222221222221 is a deficient number, since it is larger than the sum of its proper divisors (19202020111123).

211222221222221 is a wasteful number, since it uses less digits than its factorization.

211222221222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19202020111122.

The product of its digits is 2048, while the sum is 26.

Adding to 211222221222221 its reverse (122222122222112), we get a palindrome (333444343444333).

The spelling of 211222221222221 in words is "two hundred eleven trillion, two hundred twenty-two billion, two hundred twenty-one million, two hundred twenty-two thousand, two hundred twenty-one".