21222022222 has 32 divisors (see below), whose sum is σ = 34622853120. Its totient is φ = 9718846560.

The previous prime is 21222022153. The next prime is 21222022223. The reversal of 21222022222 is 22222022212.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a self number, because there is not a number n which added to its sum of digits gives 21222022222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222022223) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1291168 + ... + 1307500.

It is an arithmetic number, because the mean of its divisors is an integer number (1081964160).

Almost surely, 2^21222022222 is an apocalyptic number.

21222022222 is a deficient number, since it is larger than the sum of its proper divisors (13400830898).

21222022222 is a wasteful number, since it uses less digits than its factorization.

21222022222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17488.

The product of its (nonzero) digits is 512, while the sum is 19.

Adding to 21222022222 its reverse (22222022212), we get a palindrome (43444044434).

The spelling of 21222022222 in words is "twenty-one billion, two hundred twenty-two million, twenty-two thousand, two hundred twenty-two".