21712484543 has 8 divisors (see below), whose sum is σ = 22345858128. Its totient is φ = 21084948864.

The previous prime is 21712484539. The next prime is 21712484551. The reversal of 21712484543 is 34548421712.

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

It is not a de Polignac number, because 21712484543 - 2² = 21712484539 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 21712484543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21712484743) 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, 1451930 + ... + 1466807.

It is an arithmetic number, because the mean of its divisors is an integer number (2793232266).

Almost surely, 2^21712484543 is an apocalyptic number.

21712484543 is a deficient number, since it is larger than the sum of its proper divisors (633373585).

21712484543 is a wasteful number, since it uses less digits than its factorization.

21712484543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2918953.

The product of its digits is 215040, while the sum is 41.

The spelling of 21712484543 in words is "twenty-one billion, seven hundred twelve million, four hundred eighty-four thousand, five hundred forty-three".