21205034335 has 8 divisors (see below), whose sum is σ = 25697982816. Its totient is φ = 16796066400.

The previous prime is 21205034309. The next prime is 21205034353. The reversal of 21205034335 is 53343050212.

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

It is a de Polignac number, because none of the positive numbers 2^k-21205034335 is a prime.

It is a super-2 number, since 2×21205034335² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20994579 + ... + 20995588.

It is an arithmetic number, because the mean of its divisors is an integer number (3212247852).

Almost surely, 2^21205034335 is an apocalyptic number.

21205034335 is a deficient number, since it is larger than the sum of its proper divisors (4492948481).

21205034335 is a wasteful number, since it uses less digits than its factorization.

21205034335 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41990273.

The product of its (nonzero) digits is 10800, while the sum is 28.

Adding to 21205034335 its reverse (53343050212), we get a palindrome (74548084547).

The spelling of 21205034335 in words is "twenty-one billion, two hundred five million, thirty-four thousand, three hundred thirty-five".