21344022 has 48 divisors (see below), whose sum is σ = 53737632. Its totient is φ = 5996160.

The previous prime is 21344021. The next prime is 21344033. The reversal of 21344022 is 22044312.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21343986 and 21344004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21344021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6298 + ... + 9074.

It is an arithmetic number, because the mean of its divisors is an integer number (1119534).

Almost surely, 2^21344022 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21344022, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26868816).

21344022 is an abundant number, since it is smaller than the sum of its proper divisors (32393610).

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

21344022 is a wasteful number, since it uses less digits than its factorization.

21344022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2853 (or 2850 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 21344022 is about 4619.9590907280. The cubic root of 21344022 is about 277.3908214287.

Adding to 21344022 its reverse (22044312), we get a palindrome (43388334).

The spelling of 21344022 in words is "twenty-one million, three hundred forty-four thousand, twenty-two".