21152 has 12 divisors (see below), whose sum is σ = 41706. Its totient is φ = 10560.

The previous prime is 21149. The next prime is 21157. The reversal of 21152 is 25112.

It can be written as a sum of positive squares in only one way, i.e., 15376 + 5776 = 124^2 + 76^2 .

It is a plaindrome in base 14.

It is a nialpdrome in base 13.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 21152.

It is not an unprimeable number, because it can be changed into a prime (21157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 299 + ... + 362.

2²¹¹⁵² is an apocalyptic number.

It is an amenable number.

21152 is a deficient number, since it is larger than the sum of its proper divisors (20554).

21152 is an equidigital number, since it uses as much as digits as its factorization.

21152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 671 (or 663 counting only the distinct ones).

The product of its digits is 20, while the sum is 11.

The square root of 21152 is about 145.4372717016. The cubic root of 21152 is about 27.6556463262.

Adding to 21152 its reverse (25112), we get a palindrome (46264).

It can be divided in two parts, 2 and 1152, that multiplied together give a square (2304 = 48²).

The spelling of 21152 in words is "twenty-one thousand, one hundred fifty-two".