21340344041 has 4 divisors (see below), whose sum is σ = 21425365584. Its totient is φ = 21255322500.

The previous prime is 21340344037. The next prime is 21340344043. The reversal of 21340344041 is 14044304312.

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 a cyclic number.

It is not a de Polignac number, because 21340344041 - 2² = 21340344037 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21340344041.

It is not an unprimeable number, because it can be changed into a prime (21340344043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42510395 + ... + 42510896.

It is an arithmetic number, because the mean of its divisors is an integer number (5356341396).

Almost surely, 2^21340344041 is an apocalyptic number.

It is an amenable number.

21340344041 is a deficient number, since it is larger than the sum of its proper divisors (85021543).

21340344041 is an equidigital number, since it uses as much as digits as its factorization.

21340344041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85021542.

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 21340344041 its reverse (14044304312), we get a palindrome (35384648353).

The spelling of 21340344041 in words is "twenty-one billion, three hundred forty million, three hundred forty-four thousand, forty-one".