21171054443 has 8 divisors (see below), whose sum is σ = 26395080960. Its totient is φ = 16496925480.

The previous prime is 21171054433. The next prime is 21171054451. The reversal of 21171054443 is 34445017112.

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

It is not a de Polignac number, because 21171054443 - 2¹⁸ = 21170792299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21171054433) 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, 137474303 + ... + 137474456.

It is an arithmetic number, because the mean of its divisors is an integer number (3299385120).

Almost surely, 2^21171054443 is an apocalyptic number.

21171054443 is a deficient number, since it is larger than the sum of its proper divisors (5224026517).

21171054443 is a wasteful number, since it uses less digits than its factorization.

21171054443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274948777.

The product of its (nonzero) digits is 13440, while the sum is 32.

The spelling of 21171054443 in words is "twenty-one billion, one hundred seventy-one million, fifty-four thousand, four hundred forty-three".