21170546443 has 16 divisors (see below), whose sum is σ = 22836326400. Its totient is φ = 19568751840.

The previous prime is 21170546417. The next prime is 21170546477. The reversal of 21170546443 is 34464507112.

It is a cyclic number.

It is not a de Polignac number, because 21170546443 - 2¹³ = 21170538251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21170546483) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 484578 + ... + 526456.

It is an arithmetic number, because the mean of its divisors is an integer number (1427270400).

Almost surely, 2^21170546443 is an apocalyptic number.

21170546443 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21170546443 is a deficient number, since it is larger than the sum of its proper divisors (1665779957).

21170546443 is a wasteful number, since it uses less digits than its factorization.

21170546443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42642.

The product of its (nonzero) digits is 80640, while the sum is 37.

The spelling of 21170546443 in words is "twenty-one billion, one hundred seventy million, five hundred forty-six thousand, four hundred forty-three".