211221222210168 has 32 divisors (see below), whose sum is σ = 528055716056400. Its totient is φ = 70406719332608.

The previous prime is 211221222210137. The next prime is 211221222210169. The reversal of 211221222210168 is 861012222122112.

It is a happy number.

It is a super-2 number, since 2×211221222210168² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211221222210169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17286453 + ... + 26856356.

Almost surely, 2^{211221222210168} is an apocalyptic number.

It is an amenable number.

211221222210168 is an abundant number, since it is smaller than the sum of its proper divisors (316834493846232).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211221222210168 is a wasteful number, since it uses less digits than its factorization.

211221222210168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44342191 (or 44342187 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 33.

The spelling of 211221222210168 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred twenty-two million, two hundred ten thousand, one hundred sixty-eight".