21002443041 has 16 divisors (see below), whose sum is σ = 29571314240. Its totient is φ = 13222310400.

The previous prime is 21002443039. The next prime is 21002443051. The reversal of 21002443041 is 14034420012.

It is not a de Polignac number, because 21002443041 - 2¹ = 21002443039 is a prime.

It is a super-2 number, since 2×21002443041² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21002442999 and 21002443017.

It is not an unprimeable number, because it can be changed into a prime (21002443051) 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 15 ways as a sum of consecutive naturals, for example, 570760 + ... + 606441.

It is an arithmetic number, because the mean of its divisors is an integer number (1848207140).

Almost surely, 2^21002443041 is an apocalyptic number.

It is an amenable number.

21002443041 is a deficient number, since it is larger than the sum of its proper divisors (8568871199).

21002443041 is a wasteful number, since it uses less digits than its factorization.

21002443041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1177536.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21002443041 its reverse (14034420012), we get a palindrome (35036863053).

The spelling of 21002443041 in words is "twenty-one billion, two million, four hundred forty-three thousand, forty-one".