21324458 has 16 divisors (see below), whose sum is σ = 32495904. Its totient is φ = 10494000.

The previous prime is 21324451. The next prime is 21324463. The reversal of 21324458 is 85442312.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21324458.

It is not an unprimeable number, because it can be changed into a prime (21324451) 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, 53516 + ... + 53912.

It is an arithmetic number, because the mean of its divisors is an integer number (2030994).

Almost surely, 2^21324458 is an apocalyptic number.

21324458 is a deficient number, since it is larger than the sum of its proper divisors (11171446).

21324458 is a wasteful number, since it uses less digits than its factorization.

21324458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 757.

The product of its digits is 7680, while the sum is 29.

The square root of 21324458 is about 4617.8412705506. The cubic root of 21324458 is about 277.3060430776.

The spelling of 21324458 in words is "twenty-one million, three hundred twenty-four thousand, four hundred fifty-eight".