21824349 has 8 divisors (see below), whose sum is σ = 29776032. Its totient is φ = 14211120.

The previous prime is 21824329. The next prime is 21824353. The reversal of 21824349 is 94342812.

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

It is not a de Polignac number, because 21824349 - 2⁵ = 21824317 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21824329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84462 + ... + 84719.

It is an arithmetic number, because the mean of its divisors is an integer number (3722004).

Almost surely, 2^21824349 is an apocalyptic number.

It is an amenable number.

21824349 is a deficient number, since it is larger than the sum of its proper divisors (7951683).

21824349 is a wasteful number, since it uses less digits than its factorization.

21824349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169227.

The product of its digits is 13824, while the sum is 33.

The square root of 21824349 is about 4671.6537756987. The cubic root of 21824349 is about 279.4562107446.

The spelling of 21824349 in words is "twenty-one million, eight hundred twenty-four thousand, three hundred forty-nine".