21135153 has 8 divisors (see below), whose sum is σ = 30347968. Its totient is φ = 13006224.

The previous prime is 21135151. The next prime is 21135161. The reversal of 21135153 is 35153112.

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

It is not a de Polignac number, because 21135153 - 2¹ = 21135151 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21135151) 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, 270925 + ... + 271002.

It is an arithmetic number, because the mean of its divisors is an integer number (3793496).

Almost surely, 2^21135153 is an apocalyptic number.

It is an amenable number.

21135153 is a deficient number, since it is larger than the sum of its proper divisors (9212815).

21135153 is a wasteful number, since it uses less digits than its factorization.

21135153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541943.

The product of its digits is 450, while the sum is 21.

The square root of 21135153 is about 4597.2984458266. The cubic root of 21135153 is about 276.4830204947.

Adding to 21135153 its reverse (35153112), we get a palindrome (56288265).

The spelling of 21135153 in words is "twenty-one million, one hundred thirty-five thousand, one hundred fifty-three".