21222213324 has 96 divisors (see below), whose sum is σ = 56690914560. Its totient is φ = 6124896000.

The previous prime is 21222213293. The next prime is 21222213373. The reversal of 21222213324 is 42331222212.

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

It is a junction number, because it is equal to n+sod(n) for n = 21222213294 and 21222213303.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 263919 + ... + 334809.

It is an arithmetic number, because the mean of its divisors is an integer number (590530360).

Almost surely, 2^21222213324 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21222213324, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28345457280).

21222213324 is an abundant number, since it is smaller than the sum of its proper divisors (35468701236).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21222213324 is a wasteful number, since it uses less digits than its factorization.

21222213324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71031 (or 71029 counting only the distinct ones).

The product of its digits is 2304, while the sum is 24.

Adding to 21222213324 its reverse (42331222212), we get a palindrome (63553435536).

The spelling of 21222213324 in words is "twenty-one billion, two hundred twenty-two million, two hundred thirteen thousand, three hundred twenty-four".