21330153 has 12 divisors (see below), whose sum is σ = 33180420. Its totient is φ = 13126176.

The previous prime is 21330149. The next prime is 21330157. The reversal of 21330153 is 35103312.

It is an interprime number because it is at equal distance from previous prime (21330149) and next prime (21330157).

It can be written as a sum of positive squares in 2 ways, for example, as 11614464 + 9715689 = 3408^2 + 3117^2 .

It is not a de Polignac number, because 21330153 - 2² = 21330149 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21330157) 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 11 ways as a sum of consecutive naturals, for example, 91038 + ... + 91271.

It is an arithmetic number, because the mean of its divisors is an integer number (2765035).

Almost surely, 2^21330153 is an apocalyptic number.

It is an amenable number.

21330153 is a deficient number, since it is larger than the sum of its proper divisors (11850267).

21330153 is a wasteful number, since it uses less digits than its factorization.

21330153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182328 (or 182325 counting only the distinct ones).

The product of its (nonzero) digits is 270, while the sum is 18.

The square root of 21330153 is about 4618.4578595025. The cubic root of 21330153 is about 277.3307270555.

Adding to 21330153 its reverse (35103312), we get a palindrome (56433465).

The spelling of 21330153 in words is "twenty-one million, three hundred thirty thousand, one hundred fifty-three".