21824434 has 8 divisors (see below), whose sum is σ = 33792768. Its totient is φ = 10560180.

The previous prime is 21824419. The next prime is 21824471. The reversal of 21824434 is 43442812.

It is a happy number.

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

It is a super-3 number, since 3×21824434³ (a number of 23 digits) contains 333 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 175942 + ... + 176065.

It is an arithmetic number, because the mean of its divisors is an integer number (4224096).

Almost surely, 2^21824434 is an apocalyptic number.

21824434 is a deficient number, since it is larger than the sum of its proper divisors (11968334).

21824434 is a wasteful number, since it uses less digits than its factorization.

21824434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352040.

The product of its digits is 6144, while the sum is 28.

The square root of 21824434 is about 4671.6628731106. The cubic root of 21824434 is about 279.4565735465.

The spelling of 21824434 in words is "twenty-one million, eight hundred twenty-four thousand, four hundred thirty-four".