21041143 has 4 divisors (see below), whose sum is σ = 21258160. Its totient is φ = 20824128.

The previous prime is 21041117. The next prime is 21041191. The reversal of 21041143 is 34114012.

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

It is a cyclic number.

It is not a de Polignac number, because 21041143 - 2¹³ = 21032951 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 (21041243) 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, 108363 + ... + 108556.

It is an arithmetic number, because the mean of its divisors is an integer number (5314540).

Almost surely, 2^21041143 is an apocalyptic number.

21041143 is a deficient number, since it is larger than the sum of its proper divisors (217017).

21041143 is an equidigital number, since it uses as much as digits as its factorization.

21041143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217016.

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

The square root of 21041143 is about 4587.0625677006. The cubic root of 21041143 is about 276.0724753658.

Adding to 21041143 its reverse (34114012), we get a palindrome (55155155).

The spelling of 21041143 in words is "twenty-one million, forty-one thousand, one hundred forty-three".