21032543543 has 4 divisors (see below), whose sum is σ = 22944592968. Its totient is φ = 19120494120.

The previous prime is 21032543527. The next prime is 21032543593. The reversal of 21032543543 is 34534523012.

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

It is a cyclic number.

It is not a de Polignac number, because 21032543543 - 2⁴ = 21032543527 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21032543593) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 956024696 + ... + 956024717.

It is an arithmetic number, because the mean of its divisors is an integer number (5736148242).

Almost surely, 2^21032543543 is an apocalyptic number.

21032543543 is a deficient number, since it is larger than the sum of its proper divisors (1912049425).

21032543543 is a wasteful number, since it uses less digits than its factorization.

21032543543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1912049424.

The product of its (nonzero) digits is 43200, while the sum is 32.

The spelling of 21032543543 in words is "twenty-one billion, thirty-two million, five hundred forty-three thousand, five hundred forty-three".