21823943347 has 4 divisors (see below), whose sum is σ = 22040022096. Its totient is φ = 21607864600.

The previous prime is 21823943333. The next prime is 21823943353. The reversal of 21823943347 is 74334932812.

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 21823943347 - 2¹⁵ = 21823910579 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21823943297 and 21823943306.

It is not an unprimeable number, because it can be changed into a prime (21823943327) 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, 108039223 + ... + 108039424.

It is an arithmetic number, because the mean of its divisors is an integer number (5510005524).

Almost surely, 2^21823943347 is an apocalyptic number.

21823943347 is a deficient number, since it is larger than the sum of its proper divisors (216078749).

21823943347 is a wasteful number, since it uses less digits than its factorization.

21823943347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216078748.

The product of its digits is 870912, while the sum is 46.

The spelling of 21823943347 in words is "twenty-one billion, eight hundred twenty-three million, nine hundred forty-three thousand, three hundred forty-seven".