21241241143 has 4 divisors (see below), whose sum is σ = 21253585248. Its totient is φ = 21228897040.

The previous prime is 21241241069. The next prime is 21241241191. The reversal of 21241241143 is 34114214212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21241241143 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 (21241241743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6169471 + ... + 6172912.

It is an arithmetic number, because the mean of its divisors is an integer number (5313396312).

Almost surely, 2^21241241143 is an apocalyptic number.

21241241143 is a deficient number, since it is larger than the sum of its proper divisors (12344105).

21241241143 is a wasteful number, since it uses less digits than its factorization.

21241241143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12344104.

The product of its digits is 1536, while the sum is 25.

Adding to 21241241143 its reverse (34114214212), we get a palindrome (55355455355).

The spelling of 21241241143 in words is "twenty-one billion, two hundred forty-one million, two hundred forty-one thousand, one hundred forty-three".