21335453311 has 4 divisors (see below), whose sum is σ = 21338861824. Its totient is φ = 21332044800.

The previous prime is 21335453297. The next prime is 21335453317. The reversal of 21335453311 is 11335453312.

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 21335453311 - 2¹⁵ = 21335420543 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 (21335453317) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1694850 + ... + 1707391.

It is an arithmetic number, because the mean of its divisors is an integer number (5334715456).

Almost surely, 2^21335453311 is an apocalyptic number.

21335453311 is a deficient number, since it is larger than the sum of its proper divisors (3408513).

21335453311 is an equidigital number, since it uses as much as digits as its factorization.

21335453311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3408512.

The product of its digits is 16200, while the sum is 31.

Subtracting from 21335453311 its reverse (11335453312), we obtain a palindrome (9999999999).

The spelling of 21335453311 in words is "twenty-one billion, three hundred thirty-five million, four hundred fifty-three thousand, three hundred eleven".