21222110222110 has 128 divisors (see below), whose sum is σ = 46575474543360. Its totient is φ = 6796244189184.

The previous prime is 21222110222099. The next prime is 21222110222113. The reversal of 21222110222110 is 1122201122212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222110222113) 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 63 ways as a sum of consecutive naturals, for example, 650310354 + ... + 650342986.

It is an arithmetic number, because the mean of its divisors is an integer number (363870894870).

Almost surely, 2^{21222110222110} is an apocalyptic number.

21222110222110 is an abundant number, since it is smaller than the sum of its proper divisors (25353364321250).

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

21222110222110 is a wasteful number, since it uses less digits than its factorization.

21222110222110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36790.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21222110222110 its reverse (1122201122212), we get a palindrome (22344311344322).

The spelling of 21222110222110 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred ten million, two hundred twenty-two thousand, one hundred ten".