21330433 has 8 divisors (see below), whose sum is σ = 22197888. Its totient is φ = 20480304.

The previous prime is 21330403. The next prime is 21330443. The reversal of 21330433 is 33403312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21330433 - 2¹³ = 21322241 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21330433.

It is not an unprimeable number, because it can be changed into a prime (21330403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1791 + ... + 6772.

It is an arithmetic number, because the mean of its divisors is an integer number (2774736).

Almost surely, 2^21330433 is an apocalyptic number.

It is an amenable number.

21330433 is a deficient number, since it is larger than the sum of its proper divisors (867455).

21330433 is an equidigital number, since it uses as much as digits as its factorization.

21330433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8663.

The product of its (nonzero) digits is 648, while the sum is 19.

The square root of 21330433 is about 4618.4881725517. The cubic root of 21330433 is about 277.3319405530.

Adding to 21330433 its reverse (33403312), we get a palindrome (54733745).

The spelling of 21330433 in words is "twenty-one million, three hundred thirty thousand, four hundred thirty-three".