21241223 has 2 divisors, whose sum is σ = 21241224. Its totient is φ = 21241222.

The previous prime is 21241217. The next prime is 21241229. The reversal of 21241223 is 32214212.

It is a balanced prime because it is at equal distance from previous prime (21241217) and next prime (21241229).

It is a cyclic number.

It is not a de Polignac number, because 21241223 - 2²⁴ = 4464007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21241229) 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 as a sum of consecutive naturals, namely, 10620611 + 10620612.

It is an arithmetic number, because the mean of its divisors is an integer number (10620612).

Almost surely, 2^21241223 is an apocalyptic number.

21241223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21241223 is an equidigital number, since it uses as much as digits as its factorization.

21241223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 192, while the sum is 17.

The square root of 21241223 is about 4608.8201310097. The cubic root of 21241223 is about 276.9447730133.

Adding to 21241223 its reverse (32214212), we get a palindrome (53455435).

The spelling of 21241223 in words is "twenty-one million, two hundred forty-one thousand, two hundred twenty-three".