21453352 has 16 divisors (see below), whose sum is σ = 40340160. Its totient is φ = 10695984.

The previous prime is 21453347. The next prime is 21453353. The reversal of 21453352 is 25335412.

It is not an unprimeable number, because it can be changed into a prime (21453353) 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, 718 + ... + 6589.

It is an arithmetic number, because the mean of its divisors is an integer number (2521260).

Almost surely, 2^21453352 is an apocalyptic number.

It is an amenable number.

21453352 is a deficient number, since it is larger than the sum of its proper divisors (18886808).

21453352 is a wasteful number, since it uses less digits than its factorization.

21453352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7680 (or 7676 counting only the distinct ones).

The product of its digits is 3600, while the sum is 25.

The square root of 21453352 is about 4631.7763331145. The cubic root of 21453352 is about 277.8636392825.

Adding to 21453352 its reverse (25335412), we get a palindrome (46788764).

The spelling of 21453352 in words is "twenty-one million, four hundred fifty-three thousand, three hundred fifty-two".