21353452 has 12 divisors (see below), whose sum is σ = 37403856. Its totient is φ = 10666640.

The previous prime is 21353443. The next prime is 21353459. The reversal of 21353452 is 25435312.

It is not an unprimeable number, because it can be changed into a prime (21353459) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4278 + ... + 7810.

It is an arithmetic number, because the mean of its divisors is an integer number (3116988).

Almost surely, 2^21353452 is an apocalyptic number.

It is an amenable number.

21353452 is a deficient number, since it is larger than the sum of its proper divisors (16050404).

21353452 is a wasteful number, since it uses less digits than its factorization.

21353452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5048 (or 5046 counting only the distinct ones).

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

The square root of 21353452 is about 4620.9795498357. The cubic root of 21353452 is about 277.4316667501.

Adding to 21353452 its reverse (25435312), we get a palindrome (46788764).

The spelling of 21353452 in words is "twenty-one million, three hundred fifty-three thousand, four hundred fifty-two".