21824055 has 24 divisors (see below), whose sum is σ = 41268240. Its totient is φ = 10581120.

The previous prime is 21824021. The next prime is 21824057. The reversal of 21824055 is 55042812.

It is a happy number.

It is not a de Polignac number, because 21824055 - 2¹⁶ = 21758519 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21824057) 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 23 ways as a sum of consecutive naturals, for example, 21550 + ... + 22539.

It is an arithmetic number, because the mean of its divisors is an integer number (1719510).

Almost surely, 2^21824055 is an apocalyptic number.

21824055 is a deficient number, since it is larger than the sum of its proper divisors (19444185).

21824055 is a wasteful number, since it uses less digits than its factorization.

21824055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44111 (or 44108 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 21824055 is about 4671.6223092198. The cubic root of 21824055 is about 279.4549558695.

Adding to 21824055 its reverse (55042812), we get a palindrome (76866867).

The spelling of 21824055 in words is "twenty-one million, eight hundred twenty-four thousand, fifty-five".