21823208 has 16 divisors (see below), whose sum is σ = 44638560. Its totient is φ = 9919600.

The previous prime is 21823201. The next prime is 21823211. The reversal of 21823208 is 80232812.

It is a super-2 number, since 2×21823208² = 952504814822528, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21823201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123908 + ... + 124083.

It is an arithmetic number, because the mean of its divisors is an integer number (2789910).

Almost surely, 2^21823208 is an apocalyptic number.

It is an amenable number.

21823208 is an abundant number, since it is smaller than the sum of its proper divisors (22815352).

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

21823208 is a wasteful number, since it uses less digits than its factorization.

21823208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248008 (or 248004 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 21823208 is about 4671.5316546075. The cubic root of 21823208 is about 279.4513405712.

The spelling of 21823208 in words is "twenty-one million, eight hundred twenty-three thousand, two hundred eight".