21714241 has 4 divisors (see below), whose sum is σ = 21752452. Its totient is φ = 21676032.

The previous prime is 21714239. The next prime is 21714247. The reversal of 21714241 is 14241712.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15484225 + 6230016 = 3935^2 + 2496^2 .

It is a cyclic number.

It is not a de Polignac number, because 21714241 - 2¹ = 21714239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21714247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18240 + ... + 19393.

It is an arithmetic number, because the mean of its divisors is an integer number (5438113).

Almost surely, 2^21714241 is an apocalyptic number.

It is an amenable number.

21714241 is a deficient number, since it is larger than the sum of its proper divisors (38211).

21714241 is an equidigital number, since it uses as much as digits as its factorization.

21714241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38210.

The product of its digits is 448, while the sum is 22.

The square root of 21714241 is about 4659.8541822679. The cubic root of 21714241 is about 278.9854482118.

Adding to 21714241 its reverse (14241712), we get a palindrome (35955953).

The spelling of 21714241 in words is "twenty-one million, seven hundred fourteen thousand, two hundred forty-one".