21298543 has 8 divisors (see below), whose sum is σ = 24377760. Its totient is φ = 18228480.

The previous prime is 21298531. The next prime is 21298559. The reversal of 21298543 is 34589212.

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 21298543 - 2¹³ = 21290351 is a prime.

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

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21298499 and 21298508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21298573) 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, 3783 + ... + 7543.

It is an arithmetic number, because the mean of its divisors is an integer number (3047220).

Almost surely, 2^21298543 is an apocalyptic number.

21298543 is a deficient number, since it is larger than the sum of its proper divisors (3079217).

21298543 is an equidigital number, since it uses as much as digits as its factorization.

21298543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4577.

The product of its digits is 17280, while the sum is 34.

The square root of 21298543 is about 4615.0344527425. The cubic root of 21298543 is about 277.1936635241.

The spelling of 21298543 in words is "twenty-one million, two hundred ninety-eight thousand, five hundred forty-three".