21823053 has 16 divisors (see below), whose sum is σ = 35210880. Its totient is φ = 11736576.

The previous prime is 21823033. The next prime is 21823063. The reversal of 21823053 is 35032812.

It is not a de Polignac number, because 21823053 - 2⁸ = 21822797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21823033) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30208 + ... + 30921.

It is an arithmetic number, because the mean of its divisors is an integer number (2200680).

Almost surely, 2^21823053 is an apocalyptic number.

It is an amenable number.

21823053 is a deficient number, since it is larger than the sum of its proper divisors (13387827).

21823053 is a wasteful number, since it uses less digits than its factorization.

21823053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61156.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 21823053 is about 4671.5150647301. The cubic root of 21823053 is about 279.4506789657.

Adding to 21823053 its reverse (35032812), we get a palindrome (56855865).

The spelling of 21823053 in words is "twenty-one million, eight hundred twenty-three thousand, fifty-three".