21335115343 has 4 divisors (see below), whose sum is σ = 21911740120. Its totient is φ = 20758490568.

The previous prime is 21335115293. The next prime is 21335115359. The reversal of 21335115343 is 34351153312.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21335115343 is a prime.

It is a super-2 number, since 2×21335115343² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21335115383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 288312333 + ... + 288312406.

It is an arithmetic number, because the mean of its divisors is an integer number (5477935030).

Almost surely, 2^21335115343 is an apocalyptic number.

21335115343 is a deficient number, since it is larger than the sum of its proper divisors (576624777).

21335115343 is an equidigital number, since it uses as much as digits as its factorization.

21335115343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576624776.

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

Adding to 21335115343 its reverse (34351153312), we get a palindrome (55686268655).

The spelling of 21335115343 in words is "twenty-one billion, three hundred thirty-five million, one hundred fifteen thousand, three hundred forty-three".