21843975213 has 8 divisors (see below), whose sum is σ = 32361444800. Its totient is φ = 14562650124.

The previous prime is 21843975143. The next prime is 21843975217. The reversal of 21843975213 is 31257934812.

It is a happy number.

It is not a de Polignac number, because 21843975213 - 2¹³ = 21843967021 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 (21843975217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 404518033 + ... + 404518086.

It is an arithmetic number, because the mean of its divisors is an integer number (4045180600).

Almost surely, 2^21843975213 is an apocalyptic number.

It is an amenable number.

21843975213 is a deficient number, since it is larger than the sum of its proper divisors (10517469587).

21843975213 is an equidigital number, since it uses as much as digits as its factorization.

21843975213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809036128 (or 809036122 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The spelling of 21843975213 in words is "twenty-one billion, eight hundred forty-three million, nine hundred seventy-five thousand, two hundred thirteen".