21842521839 has 12 divisors (see below), whose sum is σ = 31556025072. Its totient is φ = 14559043200.

The previous prime is 21842521817. The next prime is 21842521853. The reversal of 21842521839 is 93812524812.

21842521839 is a `hidden beast` number, since 2 + 1 + 8 + 42 + 521 + 83 + 9 = 666.

It is not a de Polignac number, because 21842521839 - 2⁵ = 21842521807 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21842521794 and 21842521803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21842522839) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 166722 + ... + 267359.

It is an arithmetic number, because the mean of its divisors is an integer number (2629668756).

Almost surely, 2^21842521839 is an apocalyptic number.

21842521839 is a deficient number, since it is larger than the sum of its proper divisors (9713503233).

21842521839 is a wasteful number, since it uses less digits than its factorization.

21842521839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439678 (or 439675 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The spelling of 21842521839 in words is "twenty-one billion, eight hundred forty-two million, five hundred twenty-one thousand, eight hundred thirty-nine".