21332353 has 4 divisors (see below), whose sum is σ = 24379840. Its totient is φ = 18284868.

The previous prime is 21332351. The next prime is 21332357. The reversal of 21332353 is 35323312.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21332353 - 2¹ = 21332351 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21332351) 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, 1523733 + ... + 1523746.

It is an arithmetic number, because the mean of its divisors is an integer number (6094960).

Almost surely, 2^21332353 is an apocalyptic number.

It is an amenable number.

21332353 is a deficient number, since it is larger than the sum of its proper divisors (3047487).

21332353 is an equidigital number, since it uses as much as digits as its factorization.

21332353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3047486.

The product of its digits is 1620, while the sum is 22.

The square root of 21332353 is about 4618.6960281014. The cubic root of 21332353 is about 277.3402613929.

Adding to 21332353 its reverse (35323312), we get a palindrome (56655665).

The spelling of 21332353 in words is "twenty-one million, three hundred thirty-two thousand, three hundred fifty-three".