21222031222 has 12 divisors (see below), whose sum is σ = 37030279140. Its totient is φ = 9095156196.

The previous prime is 21222031163. The next prime is 21222031231. The reversal of 21222031222 is 22213022212.

It is a self number, because there is not a number n which added to its sum of digits gives 21222031222.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 108275572 + ... + 108275767.

It is an arithmetic number, because the mean of its divisors is an integer number (3085856595).

Almost surely, 2^21222031222 is an apocalyptic number.

21222031222 is a deficient number, since it is larger than the sum of its proper divisors (15808247918).

21222031222 is a wasteful number, since it uses less digits than its factorization.

21222031222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216551355 (or 216551348 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21222031222 its reverse (22213022212), we get a palindrome (43435053434).

The spelling of 21222031222 in words is "twenty-one billion, two hundred twenty-two million, thirty-one thousand, two hundred twenty-two".