21174064543 has 4 divisors (see below), whose sum is σ = 21314290288. Its totient is φ = 21033838800.

The previous prime is 21174064537. The next prime is 21174064579. The reversal of 21174064543 is 34546047112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21174064543 is a prime.

It is a super-3 number, since 3×21174064543³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21174064643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70112646 + ... + 70112947.

It is an arithmetic number, because the mean of its divisors is an integer number (5328572572).

Almost surely, 2^21174064543 is an apocalyptic number.

21174064543 is a deficient number, since it is larger than the sum of its proper divisors (140225745).

21174064543 is a wasteful number, since it uses less digits than its factorization.

21174064543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140225744.

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

The spelling of 21174064543 in words is "twenty-one billion, one hundred seventy-four million, sixty-four thousand, five hundred forty-three".