21454543 has 8 divisors (see below), whose sum is σ = 23504976. Its totient is φ = 19420800.

The previous prime is 21454541. The next prime is 21454547. The reversal of 21454543 is 34545412.

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 21454543 - 2¹ = 21454541 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21454541) 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, 1396 + ... + 6697.

It is an arithmetic number, because the mean of its divisors is an integer number (2938122).

Almost surely, 2^21454543 is an apocalyptic number.

21454543 is a deficient number, since it is larger than the sum of its proper divisors (2050433).

21454543 is a wasteful number, since it uses less digits than its factorization.

21454543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8345.

The product of its digits is 9600, while the sum is 28.

The square root of 21454543 is about 4631.9048997146. The cubic root of 21454543 is about 277.8687811281.

Adding to 21454543 its reverse (34545412), we get a palindrome (55999955).

The spelling of 21454543 in words is "twenty-one million, four hundred fifty-four thousand, five hundred forty-three".