21919645343 has 4 divisors (see below), whose sum is σ = 21928267488. Its totient is φ = 21911023200.

The previous prime is 21919645333. The next prime is 21919645369. The reversal of 21919645343 is 34354691912.

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 21919645343 - 2⁴ = 21919645327 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 (21919645303) 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, 4307258 + ... + 4312343.

It is an arithmetic number, because the mean of its divisors is an integer number (5482066872).

Almost surely, 2^21919645343 is an apocalyptic number.

21919645343 is a deficient number, since it is larger than the sum of its proper divisors (8622145).

21919645343 is an equidigital number, since it uses as much as digits as its factorization.

21919645343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8622144.

The product of its digits is 699840, while the sum is 47.

The spelling of 21919645343 in words is "twenty-one billion, nine hundred nineteen million, six hundred forty-five thousand, three hundred forty-three".