21486543 has 8 divisors (see below), whose sum is σ = 30852528. Its totient is φ = 13222464.

The previous prime is 21486539. The next prime is 21486551. The reversal of 21486543 is 34568412.

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

It is not a de Polignac number, because 21486543 - 2² = 21486539 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21486523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 275430 + ... + 275507.

It is an arithmetic number, because the mean of its divisors is an integer number (3856566).

Almost surely, 2^21486543 is an apocalyptic number.

21486543 is a deficient number, since it is larger than the sum of its proper divisors (9365985).

21486543 is a wasteful number, since it uses less digits than its factorization.

21486543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550953.

The product of its digits is 23040, while the sum is 33.

The square root of 21486543 is about 4635.3579149835. The cubic root of 21486543 is about 278.0068619668.

The spelling of 21486543 in words is "twenty-one million, four hundred eighty-six thousand, five hundred forty-three".