21241743 has 8 divisors (see below), whose sum is σ = 28350000. Its totient is φ = 14147328.

The previous prime is 21241729. The next prime is 21241763. The reversal of 21241743 is 34714212.

It is a happy number.

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

It is not a de Polignac number, because 21241743 - 2¹⁰ = 21240719 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 913 + ... + 6581.

It is an arithmetic number, because the mean of its divisors is an integer number (3543750).

Almost surely, 2^21241743 is an apocalyptic number.

21241743 is a deficient number, since it is larger than the sum of its proper divisors (7108257).

21241743 is a wasteful number, since it uses less digits than its factorization.

21241743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6921.

The product of its digits is 1344, while the sum is 24.

The square root of 21241743 is about 4608.8765442350. The cubic root of 21241743 is about 276.9470329287.

Adding to 21241743 its reverse (34714212), we get a palindrome (55955955).

The spelling of 21241743 in words is "twenty-one million, two hundred forty-one thousand, seven hundred forty-three".