21153295 has 4 divisors (see below), whose sum is σ = 25383960. Its totient is φ = 16922632.

The previous prime is 21153281. The next prime is 21153299. The reversal of 21153295 is 59235112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21153295 - 2⁵ = 21153263 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21153299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2115325 + ... + 2115334.

It is an arithmetic number, because the mean of its divisors is an integer number (6345990).

Almost surely, 2^21153295 is an apocalyptic number.

21153295 is a deficient number, since it is larger than the sum of its proper divisors (4230665).

21153295 is an equidigital number, since it uses as much as digits as its factorization.

21153295 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4230664.

The product of its digits is 2700, while the sum is 28.

The square root of 21153295 is about 4599.2711379087. The cubic root of 21153295 is about 276.5621070674.

The spelling of 21153295 in words is "twenty-one million, one hundred fifty-three thousand, two hundred ninety-five".