21004243041 has 16 divisors (see below), whose sum is σ = 28260691200. Its totient is φ = 13875375360.

The previous prime is 21004243003. The next prime is 21004243079. The reversal of 21004243041 is 14034240012.

It is an interprime number because it is at equal distance from previous prime (21004243003) and next prime (21004243079).

It is not a de Polignac number, because 21004243041 - 2⁶ = 21004242977 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21004242999 and 21004243017.

It is not an unprimeable number, because it can be changed into a prime (21004243441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2487096 + ... + 2495526.

It is an arithmetic number, because the mean of its divisors is an integer number (1766293200).

Almost surely, 2^21004243041 is an apocalyptic number.

It is an amenable number.

21004243041 is a deficient number, since it is larger than the sum of its proper divisors (7256448159).

21004243041 is a wasteful number, since it uses less digits than its factorization.

21004243041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15896.

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

Adding to 21004243041 its reverse (14034240012), we get a palindrome (35038483053).

The spelling of 21004243041 in words is "twenty-one billion, four million, two hundred forty-three thousand, forty-one".