21003441 has 8 divisors (see below), whose sum is σ = 28025760. Its totient is φ = 13991712.

The previous prime is 21003431. The next prime is 21003473. The reversal of 21003441 is 14430012.

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

It is not a de Polignac number, because 21003441 - 2⁹ = 21002929 is a prime.

It is a super-2 number, since 2×21003441² = 882289067680962, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21003441.

It is not an unprimeable number, because it can be changed into a prime (21003431) 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 7 ways as a sum of consecutive naturals, for example, 6570 + ... + 9228.

It is an arithmetic number, because the mean of its divisors is an integer number (3503220).

Almost surely, 2^21003441 is an apocalyptic number.

It is an amenable number.

21003441 is a deficient number, since it is larger than the sum of its proper divisors (7022319).

21003441 is a wasteful number, since it uses less digits than its factorization.

21003441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5295.

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

The square root of 21003441 is about 4582.9511234575. The cubic root of 21003441 is about 275.9074857962.

Adding to 21003441 its reverse (14430012), we get a palindrome (35433453).

The spelling of 21003441 in words is "twenty-one million, three thousand, four hundred forty-one".