21703603543 has 4 divisors (see below), whose sum is σ = 21723175080. Its totient is φ = 21684032008.

The previous prime is 21703603513. The next prime is 21703603549. The reversal of 21703603543 is 34530630712.

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 21703603543 - 2²¹ = 21701506391 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21703603499 and 21703603508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21703603549) 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, 9784105 + ... + 9786322.

It is an arithmetic number, because the mean of its divisors is an integer number (5430793770).

Almost surely, 2^21703603543 is an apocalyptic number.

21703603543 is a deficient number, since it is larger than the sum of its proper divisors (19571537).

21703603543 is a wasteful number, since it uses less digits than its factorization.

21703603543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19571536.

The product of its (nonzero) digits is 45360, while the sum is 34.

The spelling of 21703603543 in words is "twenty-one billion, seven hundred three million, six hundred three thousand, five hundred forty-three".