21353053 has 2 divisors, whose sum is σ = 21353054. Its totient is φ = 21353052.

The previous prime is 21353051. The next prime is 21353063. The reversal of 21353053 is 35035312.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16499844 + 4853209 = 4062^2 + 2203^2 .

It is a cyclic number.

It is not a de Polignac number, because 21353053 - 2¹ = 21353051 is a prime.

Together with 21353051, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21353051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10676526 + 10676527.

It is an arithmetic number, because the mean of its divisors is an integer number (10676527).

Almost surely, 2^21353053 is an apocalyptic number.

It is an amenable number.

21353053 is a deficient number, since it is larger than the sum of its proper divisors (1).

21353053 is an equidigital number, since it uses as much as digits as its factorization.

21353053 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1350, while the sum is 22.

The square root of 21353053 is about 4620.9363769695. The cubic root of 21353053 is about 277.4299387558.

Adding to 21353053 its reverse (35035312), we get a palindrome (56388365).

The spelling of 21353053 in words is "twenty-one million, three hundred fifty-three thousand, fifty-three".