21765434783 has 8 divisors (see below), whose sum is σ = 22546823040. Its totient is φ = 20995976320.

The previous prime is 21765434777. The next prime is 21765434797. The reversal of 21765434783 is 38743456712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21765434783 - 2¹⁰ = 21765433759 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 (21765434723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2978735 + ... + 2986032.

It is an arithmetic number, because the mean of its divisors is an integer number (2818352880).

Almost surely, 2^21765434783 is an apocalyptic number.

21765434783 is a deficient number, since it is larger than the sum of its proper divisors (781388257).

21765434783 is an equidigital number, since it uses as much as digits as its factorization.

21765434783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5964897.

The product of its digits is 3386880, while the sum is 50.

The spelling of 21765434783 in words is "twenty-one billion, seven hundred sixty-five million, four hundred thirty-four thousand, seven hundred eighty-three".