21340241 has 8 divisors (see below), whose sum is σ = 23372160. Its totient is φ = 19364112.

The previous prime is 21340223. The next prime is 21340243. The reversal of 21340241 is 14204312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21340241 - 2⁶ = 21340177 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21340243) 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, 13145 + ... + 14678.

It is an arithmetic number, because the mean of its divisors is an integer number (2921520).

Almost surely, 2^21340241 is an apocalyptic number.

It is an amenable number.

21340241 is a deficient number, since it is larger than the sum of its proper divisors (2031919).

21340241 is a wasteful number, since it uses less digits than its factorization.

21340241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27895.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 21340241 is about 4619.5498698466. The cubic root of 21340241 is about 277.3744409385.

Adding to 21340241 its reverse (14204312), we get a palindrome (35544553).

The spelling of 21340241 in words is "twenty-one million, three hundred forty thousand, two hundred forty-one".