21531054543 has 8 divisors (see below), whose sum is σ = 30219024000. Its totient is φ = 13598560728.

The previous prime is 21531054539. The next prime is 21531054551. The reversal of 21531054543 is 34545013512.

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

It is not a de Polignac number, because 21531054543 - 2² = 21531054539 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21531054583) 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, 188868843 + ... + 188868956.

It is an arithmetic number, because the mean of its divisors is an integer number (3777378000).

Almost surely, 2^21531054543 is an apocalyptic number.

21531054543 is a deficient number, since it is larger than the sum of its proper divisors (8687969457).

21531054543 is a wasteful number, since it uses less digits than its factorization.

21531054543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377737821.

The product of its (nonzero) digits is 36000, while the sum is 33.

The spelling of 21531054543 in words is "twenty-one billion, five hundred thirty-one million, fifty-four thousand, five hundred forty-three".