21853831971 has 8 divisors (see below), whose sum is σ = 29183761600. Its totient is φ = 14546561832.

The previous prime is 21853831957. The next prime is 21853831973. The reversal of 21853831971 is 17913835812.

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

It is not a de Polignac number, because 21853831971 - 2⁹ = 21853831459 is a prime.

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 21853831971.

It is not an unprimeable number, because it can be changed into a prime (21853831973) 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, 5662621 + ... + 5666478.

It is an arithmetic number, because the mean of its divisors is an integer number (3647970200).

Almost surely, 2^21853831971 is an apocalyptic number.

21853831971 is a deficient number, since it is larger than the sum of its proper divisors (7329929629).

21853831971 is a wasteful number, since it uses less digits than its factorization.

21853831971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11329745.

The product of its digits is 362880, while the sum is 48.

The spelling of 21853831971 in words is "twenty-one billion, eight hundred fifty-three million, eight hundred thirty-one thousand, nine hundred seventy-one".