21484643 has 8 divisors (see below), whose sum is σ = 22235136. Its totient is φ = 20737800.

The previous prime is 21484607. The next prime is 21484669. The reversal of 21484643 is 34648412.

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 21484643 - 2¹⁴ = 21468259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21484343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16838 + ... + 18068.

It is an arithmetic number, because the mean of its divisors is an integer number (2779392).

Almost surely, 2^21484643 is an apocalyptic number.

21484643 is a deficient number, since it is larger than the sum of its proper divisors (750493).

21484643 is a wasteful number, since it uses less digits than its factorization.

21484643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1825.

The product of its digits is 18432, while the sum is 32.

The square root of 21484643 is about 4635.1529640347. The cubic root of 21484643 is about 277.9986672469.

The spelling of 21484643 in words is "twenty-one million, four hundred eighty-four thousand, six hundred forty-three".