21440341 has 16 divisors (see below), whose sum is σ = 24720640. Its totient is φ = 18429120.

The previous prime is 21440317. The next prime is 21440351. The reversal of 21440341 is 14304412.

It is a cyclic number.

It is not a de Polignac number, because 21440341 - 2¹⁹ = 20916053 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21440351) 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 15 ways as a sum of consecutive naturals, for example, 14356 + ... + 15778.

It is an arithmetic number, because the mean of its divisors is an integer number (1545040).

Almost surely, 2^21440341 is an apocalyptic number.

It is an amenable number.

21440341 is a deficient number, since it is larger than the sum of its proper divisors (3280299).

21440341 is a wasteful number, since it uses less digits than its factorization.

21440341 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1516.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 21440341 is about 4630.3715833613. The cubic root of 21440341 is about 277.8074551344.

Adding to 21440341 its reverse (14304412), we get a palindrome (35744753).

The spelling of 21440341 in words is "twenty-one million, four hundred forty thousand, three hundred forty-one".