21411392 has 28 divisors (see below), whose sum is σ = 42938700. Its totient is φ = 10592256.

The previous prime is 21411361. The next prime is 21411407. The reversal of 21411392 is 29311412.

It can be written as a sum of positive squares in 2 ways, for example, as 3297856 + 18113536 = 1816^2 + 4256^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4484 + ... + 7932.

It is an arithmetic number, because the mean of its divisors is an integer number (1533525).

Almost surely, 2^21411392 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 21411392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21469350).

21411392 is an abundant number, since it is smaller than the sum of its proper divisors (21527308).

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

21411392 is an equidigital number, since it uses as much as digits as its factorization.

21411392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3558 (or 3548 counting only the distinct ones).

The product of its digits is 432, while the sum is 23.

The square root of 21411392 is about 4627.2445364385. The cubic root of 21411392 is about 277.6823658566.

The spelling of 21411392 in words is "twenty-one million, four hundred eleven thousand, three hundred ninety-two".