21004340335 has 8 divisors (see below), whose sum is σ = 27496591056. Its totient is φ = 15275883840.

The previous prime is 21004340321. The next prime is 21004340353. The reversal of 21004340335 is 53304340012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21004340335 - 2¹⁷ = 21004209263 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190948494 + ... + 190948603.

It is an arithmetic number, because the mean of its divisors is an integer number (3437073882).

Almost surely, 2^21004340335 is an apocalyptic number.

21004340335 is a deficient number, since it is larger than the sum of its proper divisors (6492250721).

21004340335 is a wasteful number, since it uses less digits than its factorization.

21004340335 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381897113.

The product of its (nonzero) digits is 4320, while the sum is 25.

Adding to 21004340335 its reverse (53304340012), we get a palindrome (74308680347).

The spelling of 21004340335 in words is "twenty-one billion, four million, three hundred forty thousand, three hundred thirty-five".