21221323222 has 16 divisors (see below), whose sum is σ = 34783603344. Its totient is φ = 9630000000.

The previous prime is 21221323217. The next prime is 21221323237. The reversal of 21221323222 is 22232312212.

It is a super-2 number, since 2×21221323222² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 21221323193 and 21221323202.

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, 789279 + ... + 815722.

It is an arithmetic number, because the mean of its divisors is an integer number (2173975209).

Almost surely, 2^21221323222 is an apocalyptic number.

21221323222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21221323222 is a deficient number, since it is larger than the sum of its proper divisors (13562280122).

21221323222 is a wasteful number, since it uses less digits than its factorization.

21221323222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1605615.

The product of its digits is 1152, while the sum is 22.

Adding to 21221323222 its reverse (22232312212), we get a palindrome (43453635434).

It can be divided in two parts, 21221 and 323222, that added together give a palindrome (344443).

The spelling of 21221323222 in words is "twenty-one billion, two hundred twenty-one million, three hundred twenty-three thousand, two hundred twenty-two".