21343110353 has 4 divisors (see below), whose sum is σ = 21343514688. Its totient is φ = 21342706020.

The previous prime is 21343110323. The next prime is 21343110391. The reversal of 21343110353 is 35301134312.

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 21343110353 - 2¹⁴ = 21343093969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21343110323) 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, 108533 + ... + 233378.

It is an arithmetic number, because the mean of its divisors is an integer number (5335878672).

Almost surely, 2^21343110353 is an apocalyptic number.

It is an amenable number.

21343110353 is a deficient number, since it is larger than the sum of its proper divisors (404335).

21343110353 is an equidigital number, since it uses as much as digits as its factorization.

21343110353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404334.

The product of its (nonzero) digits is 3240, while the sum is 26.

Adding to 21343110353 its reverse (35301134312), we get a palindrome (56644244665).

The spelling of 21343110353 in words is "twenty-one billion, three hundred forty-three million, one hundred ten thousand, three hundred fifty-three".