21330466 has 4 divisors (see below), whose sum is σ = 31995702. Its totient is φ = 10665232.

The previous prime is 21330443. The next prime is 21330467. The reversal of 21330466 is 66403312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 16362025 + 4968441 = 4045^2 + 2229^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21330466.

It is not an unprimeable number, because it can be changed into a prime (21330467) 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, 5332615 + ... + 5332618.

Almost surely, 2^21330466 is an apocalyptic number.

21330466 is a deficient number, since it is larger than the sum of its proper divisors (10665236).

21330466 is a wasteful number, since it uses less digits than its factorization.

21330466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10665235.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 21330466 is about 4618.4917451480. The cubic root of 21330466 is about 277.3320835717.

Adding to 21330466 its reverse (66403312), we get a palindrome (87733778).

The spelling of 21330466 in words is "twenty-one million, three hundred thirty thousand, four hundred sixty-six".