21222344 has 48 divisors (see below), whose sum is σ = 47038320. Its totient is φ = 8898240.

The previous prime is 21222343. The next prime is 21222347. The reversal of 21222344 is 44322212.

It is a super-3 number, since 3×21222344³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21222343) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14159 + ... + 15585.

It is an arithmetic number, because the mean of its divisors is an integer number (979965).

Almost surely, 2^21222344 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 21222344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23519160).

21222344 is an abundant number, since it is smaller than the sum of its proper divisors (25815976).

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

21222344 is a wasteful number, since it uses less digits than its factorization.

21222344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1470 (or 1453 counting only the distinct ones).

The product of its digits is 768, while the sum is 20.

The square root of 21222344 is about 4606.7715376389. The cubic root of 21222344 is about 276.8627000533.

Adding to 21222344 its reverse (44322212), we get a palindrome (65544556).

The spelling of 21222344 in words is "twenty-one million, two hundred twenty-two thousand, three hundred forty-four".