21110122222 has 16 divisors (see below), whose sum is σ = 36561863520. Its totient is φ = 8953924608.

The previous prime is 21110122213. The next prime is 21110122247. The reversal of 21110122222 is 22222101112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21110122196 and 21110122205.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7771147 + ... + 7773862.

It is an arithmetic number, because the mean of its divisors is an integer number (2285116470).

Almost surely, 2^21110122222 is an apocalyptic number.

21110122222 is a deficient number, since it is larger than the sum of its proper divisors (15451741298).

21110122222 is a wasteful number, since it uses less digits than its factorization.

21110122222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15545115.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21110122222 its reverse (22222101112), we get a palindrome (43332223334).

The spelling of 21110122222 in words is "twenty-one billion, one hundred ten million, one hundred twenty-two thousand, two hundred twenty-two".