21323066 has 16 divisors (see below), whose sum is σ = 34507944. Its totient is φ = 9844224.

The previous prime is 21323059. The next prime is 21323069. The reversal of 21323066 is 66032312.

It can be written as a sum of positive squares in 4 ways, for example, as 20894041 + 429025 = 4571^2 + 655^2 .

It is not an unprimeable number, because it can be changed into a prime (21323069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4115 + ... + 7718.

Almost surely, 2^21323066 is an apocalyptic number.

21323066 is a deficient number, since it is larger than the sum of its proper divisors (13184878).

21323066 is a wasteful number, since it uses less digits than its factorization.

21323066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11905.

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 21323066 is about 4617.6905483153. The cubic root of 21323066 is about 277.3000090296.

Adding to 21323066 its reverse (66032312), we get a palindrome (87355378).

It can be divided in two parts, 2132306 and 6, that added together give a palindrome (2132312).

The spelling of 21323066 in words is "twenty-one million, three hundred twenty-three thousand, sixty-six".