21943983535 has 12 divisors (see below), whose sum is σ = 26771564664. Its totient is φ = 17267382240.

The previous prime is 21943983499. The next prime is 21943983541. The reversal of 21943983535 is 53538934912.

It is not a de Polignac number, because 21943983535 - 2²³ = 21935594927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 571129 + ... + 608338.

It is an arithmetic number, because the mean of its divisors is an integer number (2230963722).

Almost surely, 2^21943983535 is an apocalyptic number.

21943983535 is a deficient number, since it is larger than the sum of its proper divisors (4827581129).

21943983535 is an equidigital number, since it uses as much as digits as its factorization.

21943983535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1179594 (or 1179533 counting only the distinct ones).

The product of its digits is 3499200, while the sum is 52.

The spelling of 21943983535 in words is "twenty-one billion, nine hundred forty-three million, nine hundred eighty-three thousand, five hundred thirty-five".