21183223 has 2 divisors, whose sum is σ = 21183224. Its totient is φ = 21183222.

The previous prime is 21183209. The next prime is 21183247. The reversal of 21183223 is 32238112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21183223 - 2¹³ = 21175031 is a prime.

It is equal to p_1340806 and since 21183223 and 1340806 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 21183194 and 21183203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21183923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10591611 + 10591612.

It is an arithmetic number, because the mean of its divisors is an integer number (10591612).

It is a self-describing number.

Almost surely, 2^21183223 is an apocalyptic number.

21183223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21183223 is an equidigital number, since it uses as much as digits as its factorization.

21183223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 22.

The square root of 21183223 is about 4602.5235469251. The cubic root of 21183223 is about 276.6924736818.

The spelling of 21183223 in words is "twenty-one million, one hundred eighty-three thousand, two hundred twenty-three".