21143041 has 4 divisors (see below), whose sum is σ = 21193684. Its totient is φ = 21092400.

The previous prime is 21143039. The next prime is 21143051. The reversal of 21143041 is 14034112.

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 1081600 + 20061441 = 1040^2 + 4479^2 .

It is a cyclic number.

It is not a de Polignac number, because 21143041 - 2¹ = 21143039 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21143051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24690 + ... + 25531.

It is an arithmetic number, because the mean of its divisors is an integer number (5298421).

Almost surely, 2^21143041 is an apocalyptic number.

It is an amenable number.

21143041 is a deficient number, since it is larger than the sum of its proper divisors (50643).

21143041 is an equidigital number, since it uses as much as digits as its factorization.

21143041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50642.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 21143041 is about 4598.1562609376. The cubic root of 21143041 is about 276.5174122780.

Adding to 21143041 its reverse (14034112), we get a palindrome (35177153).

The spelling of 21143041 in words is "twenty-one million, one hundred forty-three thousand, forty-one".