21011305235 has 8 divisors (see below), whose sum is σ = 25215152496. Its totient is φ = 16807986720.

The previous prime is 21011305201. The next prime is 21011305241. The reversal of 21011305235 is 53250311012.

It is a happy number.

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

It is not a de Polignac number, because 21011305235 - 2⁶ = 21011305171 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 21011305235.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 38756 + ... + 208625.

It is an arithmetic number, because the mean of its divisors is an integer number (3151894062).

Almost surely, 2^21011305235 is an apocalyptic number.

21011305235 is a deficient number, since it is larger than the sum of its proper divisors (4203847261).

21011305235 is a wasteful number, since it uses less digits than its factorization.

21011305235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264373.

The product of its (nonzero) digits is 900, while the sum is 23.

Adding to 21011305235 its reverse (53250311012), we get a palindrome (74261616247).

The spelling of 21011305235 in words is "twenty-one billion, eleven million, three hundred five thousand, two hundred thirty-five".