21241703 has 4 divisors (see below), whose sum is σ = 24276240. Its totient is φ = 18207168.

The previous prime is 21241667. The next prime is 21241723. The reversal of 21241703 is 30714212.

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

It is not a de Polignac number, because 21241703 - 2¹⁸ = 20979559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21241723) 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 3 ways as a sum of consecutive naturals, for example, 1517258 + ... + 1517271.

It is an arithmetic number, because the mean of its divisors is an integer number (6069060).

Almost surely, 2^21241703 is an apocalyptic number.

21241703 is a deficient number, since it is larger than the sum of its proper divisors (3034537).

21241703 is an equidigital number, since it uses as much as digits as its factorization.

21241703 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3034536.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 21241703 is about 4608.8722047807. The cubic root of 21241703 is about 276.9468590904.

Adding to 21241703 its reverse (30714212), we get a palindrome (51955915).

The spelling of 21241703 in words is "twenty-one million, two hundred forty-one thousand, seven hundred three".