21333134353 has 4 divisors (see below), whose sum is σ = 21343477248. Its totient is φ = 21322791460.

The previous prime is 21333134269. The next prime is 21333134377. The reversal of 21333134353 is 35343133312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21333134353 - 2⁹ = 21333133841 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21333138353) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5168353 + ... + 5172478.

It is an arithmetic number, because the mean of its divisors is an integer number (5335869312).

Almost surely, 2^21333134353 is an apocalyptic number.

It is an amenable number.

21333134353 is a deficient number, since it is larger than the sum of its proper divisors (10342895).

21333134353 is a wasteful number, since it uses less digits than its factorization.

21333134353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10342894.

The product of its digits is 29160, while the sum is 31.

Adding to 21333134353 its reverse (35343133312), we get a palindrome (56676267665).

The spelling of 21333134353 in words is "twenty-one billion, three hundred thirty-three million, one hundred thirty-four thousand, three hundred fifty-three".