21353133 has 8 divisors (see below), whose sum is σ = 28496448. Its totient is φ = 14222624.

The previous prime is 21353119. The next prime is 21353153. The reversal of 21353133 is 33135312.

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 21353133 - 2¹⁰ = 21352109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21353153) 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, 1816 + ... + 6782.

It is an arithmetic number, because the mean of its divisors is an integer number (3562056).

Almost surely, 2^21353133 is an apocalyptic number.

It is an amenable number.

21353133 is a deficient number, since it is larger than the sum of its proper divisors (7143315).

21353133 is a wasteful number, since it uses less digits than its factorization.

21353133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6403.

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

The square root of 21353133 is about 4620.9450332156. The cubic root of 21353133 is about 277.4302852226.

Adding to 21353133 its reverse (33135312), we get a palindrome (54488445).

The spelling of 21353133 in words is "twenty-one million, three hundred fifty-three thousand, one hundred thirty-three".