21170071443 has 8 divisors (see below), whose sum is σ = 28316944528. Its totient is φ = 14068289664.

The previous prime is 21170071409. The next prime is 21170071459. The reversal of 21170071443 is 34417007112.

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

It is not a de Polignac number, because 21170071443 - 2⁶ = 21170071379 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 21170071443.

It is not an unprimeable number, because it can be changed into a prime (21170071343) 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, 11271730 + ... + 11273607.

It is an arithmetic number, because the mean of its divisors is an integer number (3539618066).

Almost surely, 2^21170071443 is an apocalyptic number.

21170071443 is a deficient number, since it is larger than the sum of its proper divisors (7146873085).

21170071443 is a wasteful number, since it uses less digits than its factorization.

21170071443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22545653.

The product of its (nonzero) digits is 4704, while the sum is 30.

Adding to 21170071443 its reverse (34417007112), we get a palindrome (55587078555).

The spelling of 21170071443 in words is "twenty-one billion, one hundred seventy million, seventy-one thousand, four hundred forty-three".