21829328 has 20 divisors (see below), whose sum is σ = 44520960. Its totient is φ = 10340064.

The previous prime is 21829319. The next prime is 21829331. The reversal of 21829328 is 82392812.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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, 35600 + ... + 36207.

It is an arithmetic number, because the mean of its divisors is an integer number (2226048).

Almost surely, 2^21829328 is an apocalyptic number.

It is an amenable number.

21829328 is an abundant number, since it is smaller than the sum of its proper divisors (22691632).

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

21829328 is a wasteful number, since it uses less digits than its factorization.

21829328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71834 (or 71828 counting only the distinct ones).

The product of its digits is 13824, while the sum is 35.

The square root of 21829328 is about 4672.1866401076. The cubic root of 21829328 is about 279.4774608122.

The spelling of 21829328 in words is "twenty-one million, eight hundred twenty-nine thousand, three hundred twenty-eight".