21411344 has 40 divisors (see below), whose sum is σ = 43872192. Its totient is φ = 10102400.

The previous prime is 21411343. The next prime is 21411349. The reversal of 21411344 is 44311412.

It is not an unprimeable number, because it can be changed into a prime (21411343) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30194 + ... + 30894.

Almost surely, 2^21411344 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 21411344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21936096).

21411344 is an abundant number, since it is smaller than the sum of its proper divisors (22460848).

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

21411344 is a wasteful number, since it uses less digits than its factorization.

21411344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 815 (or 809 counting only the distinct ones).

The product of its digits is 384, while the sum is 20.

The square root of 21411344 is about 4627.2393497635. The cubic root of 21411344 is about 277.6821583539.

Adding to 21411344 its reverse (44311412), we get a palindrome (65722756).

The spelling of 21411344 in words is "twenty-one million, four hundred eleven thousand, three hundred forty-four".