21834642879 has 16 divisors (see below), whose sum is σ = 36968707840. Its totient is φ = 12476938680.

The previous prime is 21834642839. The next prime is 21834642901. The reversal of 21834642879 is 97824643812.

21834642879 is a `hidden beast` number, since 2 + 18 + 346 + 4 + 287 + 9 = 666.

It is not a de Polignac number, because 21834642879 - 2⁹ = 21834642367 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 (21834642839) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57763417 + ... + 57763794.

It is an arithmetic number, because the mean of its divisors is an integer number (2310544240).

Almost surely, 2^21834642879 is an apocalyptic number.

21834642879 is a deficient number, since it is larger than the sum of its proper divisors (15134064961).

21834642879 is a wasteful number, since it uses less digits than its factorization.

21834642879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115527227 (or 115527221 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 54.

The spelling of 21834642879 in words is "twenty-one billion, eight hundred thirty-four million, six hundred forty-two thousand, eight hundred seventy-nine".