21042024013 has 4 divisors (see below), whose sum is σ = 21439043388. Its totient is φ = 20645004640.

The previous prime is 21042024011. The next prime is 21042024037. The reversal of 21042024013 is 31042024012.

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 18448973929 + 2593050084 = 135827^2 + 50922^2 .

It is a cyclic number.

It is not a de Polignac number, because 21042024013 - 2¹ = 21042024011 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 (21042024011) 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, 198509608 + ... + 198509713.

It is an arithmetic number, because the mean of its divisors is an integer number (5359760847).

Almost surely, 2^21042024013 is an apocalyptic number.

It is an amenable number.

21042024013 is a deficient number, since it is larger than the sum of its proper divisors (397019375).

21042024013 is an equidigital number, since it uses as much as digits as its factorization.

21042024013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397019374.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21042024013 its reverse (31042024012), we get a palindrome (52084048025).

Subtracting 21042024013 from its reverse (31042024012), we obtain a palindrome (9999999999).

The spelling of 21042024013 in words is "twenty-one billion, forty-two million, twenty-four thousand, thirteen".