21252153 has 8 divisors (see below), whose sum is σ = 30515968. Its totient is φ = 13078224.

The previous prime is 21252151. The next prime is 21252167. The reversal of 21252153 is 35125212.

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

It is not a de Polignac number, because 21252153 - 2¹ = 21252151 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21252151) 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, 272425 + ... + 272502.

It is an arithmetic number, because the mean of its divisors is an integer number (3814496).

Almost surely, 2^21252153 is an apocalyptic number.

It is an amenable number.

21252153 is a deficient number, since it is larger than the sum of its proper divisors (9263815).

21252153 is a wasteful number, since it uses less digits than its factorization.

21252153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544943.

The product of its digits is 600, while the sum is 21.

The square root of 21252153 is about 4610.0057483695. The cubic root of 21252153 is about 276.9922669408.

Adding to 21252153 its reverse (35125212), we get a palindrome (56377365).

It can be divided in two parts, 2125 and 2153, that added together give a triangular number (4278 = T₉₂).

The spelling of 21252153 in words is "twenty-one million, two hundred fifty-two thousand, one hundred fifty-three".