21222211222 has 32 divisors (see below), whose sum is σ = 34289010720. Its totient is φ = 9814433280.

The previous prime is 21222211217. The next prime is 21222211267. The reversal of 21222211222 is 22211222212.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 21222211222.

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 15 ways as a sum of consecutive naturals, for example, 2706804 + ... + 2714632.

It is an arithmetic number, because the mean of its divisors is an integer number (1071531585).

Almost surely, 2^21222211222 is an apocalyptic number.

21222211222 is a deficient number, since it is larger than the sum of its proper divisors (13066799498).

21222211222 is a wasteful number, since it uses less digits than its factorization.

21222211222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9216.

The product of its digits is 256, while the sum is 19.

Adding to 21222211222 its reverse (22211222212), we get a palindrome (43433433434).

The spelling of 21222211222 in words is "twenty-one billion, two hundred twenty-two million, two hundred eleven thousand, two hundred twenty-two".