21223583 has 2 divisors, whose sum is σ = 21223584. Its totient is φ = 21223582.

The previous prime is 21223519. The next prime is 21223603. The reversal of 21223583 is 38532212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21223583 - 2⁶ = 21223519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21223283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611791 + 10611792.

It is an arithmetic number, because the mean of its divisors is an integer number (10611792).

Almost surely, 2^21223583 is an apocalyptic number.

21223583 is a deficient number, since it is larger than the sum of its proper divisors (1).

21223583 is an equidigital number, since it uses as much as digits as its factorization.

21223583 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 26.

The square root of 21223583 is about 4606.9060116308. The cubic root of 21223583 is about 276.8680878687.

Adding to 21223583 its reverse (38532212), we get a palindrome (59755795).

The spelling of 21223583 in words is "twenty-one million, two hundred twenty-three thousand, five hundred eighty-three".