21298443 has 8 divisors (see below), whose sum is σ = 28674048. Its totient is φ = 14060904.

The previous prime is 21298439. The next prime is 21298447. The reversal of 21298443 is 34489212.

It is an interprime number because it is at equal distance from previous prime (21298439) and next prime (21298447).

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

It is not a de Polignac number, because 21298443 - 2² = 21298439 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21298447) 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, 34155 + ... + 34772.

It is an arithmetic number, because the mean of its divisors is an integer number (3584256).

Almost surely, 2^21298443 is an apocalyptic number.

21298443 is a deficient number, since it is larger than the sum of its proper divisors (7375605).

21298443 is a wasteful number, since it uses less digits than its factorization.

21298443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69033.

The product of its digits is 13824, while the sum is 33.

The square root of 21298443 is about 4615.0236185744. The cubic root of 21298443 is about 277.1932297008.

The spelling of 21298443 in words is "twenty-one million, two hundred ninety-eight thousand, four hundred forty-three".