21324858 has 16 divisors (see below), whose sum is σ = 43164576. Its totient is φ = 7022480.

The previous prime is 21324857. The next prime is 21324871. The reversal of 21324858 is 85842312.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (21324857) 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, 20913 + ... + 21908.

It is an arithmetic number, because the mean of its divisors is an integer number (2697786).

Almost surely, 2^21324858 is an apocalyptic number.

21324858 is an abundant number, since it is smaller than the sum of its proper divisors (21839718).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21324858 is a wasteful number, since it uses less digits than its factorization.

21324858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42909.

The product of its digits is 15360, while the sum is 33.

The square root of 21324858 is about 4617.8845806278. The cubic root of 21324858 is about 277.3077769509.

The spelling of 21324858 in words is "twenty-one million, three hundred twenty-four thousand, eight hundred fifty-eight".