21232223 has 2 divisors, whose sum is σ = 21232224. Its totient is φ = 21232222.

The previous prime is 21232207. The next prime is 21232229. The reversal of 21232223 is 32223212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21232223 - 2⁴ = 21232207 is a prime.

It is a zygodrome in base 4.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21232229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616111 + 10616112.

It is an arithmetic number, because the mean of its divisors is an integer number (10616112).

Almost surely, 2^21232223 is an apocalyptic number.

21232223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21232223 is an equidigital number, since it uses as much as digits as its factorization.

21232223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288, while the sum is 17.

The square root of 21232223 is about 4607.8436388402. The cubic root of 21232223 is about 276.9056532465.

Adding to 21232223 its reverse (32223212), we get a palindrome (53455435).

The spelling of 21232223 in words is "twenty-one million, two hundred thirty-two thousand, two hundred twenty-three".