21738847827 has 8 divisors (see below), whose sum is σ = 28986550720. Its totient is φ = 14491855080.

The previous prime is 21738847771. The next prime is 21738847829. The reversal of 21738847827 is 72874883712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21738847827 - 2¹⁹ = 21738323539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21738847829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101449 + ... + 231882.

It is an arithmetic number, because the mean of its divisors is an integer number (3623318840).

Almost surely, 2^21738847827 is an apocalyptic number.

21738847827 is a deficient number, since it is larger than the sum of its proper divisors (7247702893).

21738847827 is a wasteful number, since it uses less digits than its factorization.

21738847827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355073.

The product of its digits is 8429568, while the sum is 57.

The spelling of 21738847827 in words is "twenty-one billion, seven hundred thirty-eight million, eight hundred forty-seven thousand, eight hundred twenty-seven".