21319543 has 8 divisors (see below), whose sum is σ = 24393600. Its totient is φ = 18252600.

The previous prime is 21319541. The next prime is 21319567. The reversal of 21319543 is 34591312.

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

It is a cyclic number.

It is not a de Polignac number, because 21319543 - 2¹ = 21319541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21319541) 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, 9108 + ... + 11206.

It is an arithmetic number, because the mean of its divisors is an integer number (3049200).

Almost surely, 2^21319543 is an apocalyptic number.

21319543 is a deficient number, since it is larger than the sum of its proper divisors (3074057).

21319543 is a wasteful number, since it uses less digits than its factorization.

21319543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3557.

The product of its digits is 3240, while the sum is 28.

The square root of 21319543 is about 4617.3090648125. The cubic root of 21319543 is about 277.2847363395.

The spelling of 21319543 in words is "twenty-one million, three hundred nineteen thousand, five hundred forty-three".