21333153 has 8 divisors (see below), whose sum is σ = 28705600. Its totient is φ = 14091408.

The previous prime is 21333139. The next prime is 21333163. The reversal of 21333153 is 35133312.

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

It is not a de Polignac number, because 21333153 - 2⁶ = 21333089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21333133) 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, 32293 + ... + 32946.

It is an arithmetic number, because the mean of its divisors is an integer number (3588200).

Almost surely, 2^21333153 is an apocalyptic number.

It is an amenable number.

21333153 is a deficient number, since it is larger than the sum of its proper divisors (7372447).

21333153 is a wasteful number, since it uses less digits than its factorization.

21333153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65351.

The product of its digits is 810, while the sum is 21.

The square root of 21333153 is about 4618.7826318198. The cubic root of 21333153 is about 277.3437282621.

Adding to 21333153 its reverse (35133312), we get a palindrome (56466465).

The spelling of 21333153 in words is "twenty-one million, three hundred thirty-three thousand, one hundred fifty-three".