21042341335 has 4 divisors (see below), whose sum is σ = 25250809608. Its totient is φ = 16833873064.

The previous prime is 21042341321. The next prime is 21042341339. The reversal of 21042341335 is 53314324012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21042341335 - 2⁵ = 21042341303 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 (21042341339) 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, 2104234129 + ... + 2104234138.

It is an arithmetic number, because the mean of its divisors is an integer number (6312702402).

Almost surely, 2^21042341335 is an apocalyptic number.

21042341335 is a deficient number, since it is larger than the sum of its proper divisors (4208468273).

21042341335 is an equidigital number, since it uses as much as digits as its factorization.

21042341335 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4208468272.

The product of its (nonzero) digits is 8640, while the sum is 28.

Adding to 21042341335 its reverse (53314324012), we get a palindrome (74356665347).

The spelling of 21042341335 in words is "twenty-one billion, forty-two million, three hundred forty-one thousand, three hundred thirty-five".