21885236839 has 4 divisors (see below), whose sum is σ = 22350880224. Its totient is φ = 21419593456.

The previous prime is 21885236809. The next prime is 21885236843. The reversal of 21885236839 is 93863258812.

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 21885236839 - 2³³ = 13295302247 is a prime.

It is a super-3 number, since 3×21885236839³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21885236839.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21885236809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 232821622 + ... + 232821715.

It is an arithmetic number, because the mean of its divisors is an integer number (5587720056).

Almost surely, 2^21885236839 is an apocalyptic number.

21885236839 is a deficient number, since it is larger than the sum of its proper divisors (465643385).

21885236839 is an equidigital number, since it uses as much as digits as its factorization.

21885236839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465643384.

The product of its digits is 4976640, while the sum is 55.

The spelling of 21885236839 in words is "twenty-one billion, eight hundred eighty-five million, two hundred thirty-six thousand, eight hundred thirty-nine".