21211222110222 has 8 divisors (see below), whose sum is σ = 42422444220456. Its totient is φ = 7070407370072.

The previous prime is 21211222110161. The next prime is 21211222110229. The reversal of 21211222110222 is 22201122211212.

It is a sphenic number, since it is the product of 3 distinct primes.

21211222110222 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211222110229) 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, 1767601842513 + ... + 1767601842524.

It is an arithmetic number, because the mean of its divisors is an integer number (5302805527557).

Almost surely, 2^{21211222110222} is an apocalyptic number.

21211222110222 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21211222110222 is a wasteful number, since it uses less digits than its factorization.

21211222110222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3535203685042.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 21211222110222 its reverse (22201122211212), we get a palindrome (43412344321434).

The spelling of 21211222110222 in words is "twenty-one trillion, two hundred eleven billion, two hundred twenty-two million, one hundred ten thousand, two hundred twenty-two".