21324579 has 8 divisors (see below), whose sum is σ = 30105360. Its totient is φ = 13380096.

The previous prime is 21324571. The next prime is 21324619. The reversal of 21324579 is 97542312.

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

It is not a de Polignac number, because 21324579 - 2³ = 21324571 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21324571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 209014 + ... + 209115.

It is an arithmetic number, because the mean of its divisors is an integer number (3763170).

Almost surely, 2^21324579 is an apocalyptic number.

21324579 is a deficient number, since it is larger than the sum of its proper divisors (8780781).

21324579 is a wasteful number, since it uses less digits than its factorization.

21324579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418149.

The product of its digits is 15120, while the sum is 33.

The square root of 21324579 is about 4617.8543718918. The cubic root of 21324579 is about 277.3065675766.

The spelling of 21324579 in words is "twenty-one million, three hundred twenty-four thousand, five hundred seventy-nine".