21201353 has 4 divisors (see below), whose sum is σ = 21262800. Its totient is φ = 21139908.

The previous prime is 21201347. The next prime is 21201373. The reversal of 21201353 is 35310212.

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 a cyclic number.

It is not a de Polignac number, because 21201353 - 2⁶ = 21201289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21201373) 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, 30203 + ... + 30896.

It is an arithmetic number, because the mean of its divisors is an integer number (5315700).

Almost surely, 2^21201353 is an apocalyptic number.

It is an amenable number.

21201353 is a deficient number, since it is larger than the sum of its proper divisors (61447).

21201353 is an equidigital number, since it uses as much as digits as its factorization.

21201353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61446.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 21201353 is about 4604.4926973555. The cubic root of 21201353 is about 276.7713883980.

Adding to 21201353 its reverse (35310212), we get a palindrome (56511565).

The spelling of 21201353 in words is "twenty-one million, two hundred one thousand, three hundred fifty-three".