21024340041 has 4 divisors (see below), whose sum is σ = 28032453392. Its totient is φ = 14016226692.

The previous prime is 21024340037. The next prime is 21024340081. The reversal of 21024340041 is 14004342012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21024340041 - 2² = 21024340037 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21024340081) 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 3 ways as a sum of consecutive naturals, for example, 3504056671 + ... + 3504056676.

It is an arithmetic number, because the mean of its divisors is an integer number (7008113348).

Almost surely, 2^21024340041 is an apocalyptic number.

It is an amenable number.

21024340041 is a deficient number, since it is larger than the sum of its proper divisors (7008113351).

21024340041 is an equidigital number, since it uses as much as digits as its factorization.

21024340041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7008113350.

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

Adding to 21024340041 its reverse (14004342012), we get a palindrome (35028682053).

The spelling of 21024340041 in words is "twenty-one billion, twenty-four million, three hundred forty thousand, forty-one".