21484543 has 2 divisors, whose sum is σ = 21484544. Its totient is φ = 21484542.

The previous prime is 21484537. The next prime is 21484571. The reversal of 21484543 is 34548412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21484543 - 2⁹ = 21484031 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21484513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10742271 + 10742272.

It is an arithmetic number, because the mean of its divisors is an integer number (10742272).

Almost surely, 2^21484543 is an apocalyptic number.

21484543 is a deficient number, since it is larger than the sum of its proper divisors (1).

21484543 is an equidigital number, since it uses as much as digits as its factorization.

21484543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15360, while the sum is 31.

The square root of 21484543 is about 4635.1421768917. The cubic root of 21484543 is about 277.9982359324.

The spelling of 21484543 in words is "twenty-one million, four hundred eighty-four thousand, five hundred forty-three".