21340041 has 8 divisors (see below), whose sum is σ = 28489344. Its totient is φ = 14208720.

The previous prime is 21340019. The next prime is 21340051. The reversal of 21340041 is 14004312.

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

It is not a de Polignac number, because 21340041 - 2⁶ = 21339977 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21340041.

It is not an unprimeable number, because it can be changed into a prime (21340051) 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 7 ways as a sum of consecutive naturals, for example, 1425 + ... + 6686.

It is an arithmetic number, because the mean of its divisors is an integer number (3561168).

Almost surely, 2^21340041 is an apocalyptic number.

It is an amenable number.

21340041 is a deficient number, since it is larger than the sum of its proper divisors (7149303).

21340041 is an equidigital number, since it uses as much as digits as its factorization.

21340041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8991.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 21340041 is about 4619.5282226652. The cubic root of 21340041 is about 277.3735744212.

Adding to 21340041 its reverse (14004312), we get a palindrome (35344353).

The spelling of 21340041 in words is "twenty-one million, three hundred forty thousand, forty-one".