21300353 has 4 divisors (see below), whose sum is σ = 21753600. Its totient is φ = 20847108.

The previous prime is 21300343. The next prime is 21300359. The reversal of 21300353 is 35300312.

21300353 = 122² + 123² + ... + 403².

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 21300353 - 2⁶ = 21300289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21300359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 226553 + ... + 226646.

It is an arithmetic number, because the mean of its divisors is an integer number (5438400).

Almost surely, 2^21300353 is an apocalyptic number.

It is an amenable number.

21300353 is a deficient number, since it is larger than the sum of its proper divisors (453247).

21300353 is an equidigital number, since it uses as much as digits as its factorization.

21300353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 453246.

The product of its (nonzero) digits is 270, while the sum is 17.

The square root of 21300353 is about 4615.2305467875. The cubic root of 21300353 is about 277.2015154903.

Adding to 21300353 its reverse (35300312), we get a palindrome (56600665).

The spelling of 21300353 in words is "twenty-one million, three hundred thousand, three hundred fifty-three".