21329053 has 4 divisors (see below), whose sum is σ = 21420828. Its totient is φ = 21237280.

The previous prime is 21329051. The next prime is 21329069. The reversal of 21329053 is 35092312.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5184729 + 16144324 = 2277^2 + 4018^2 .

It is a cyclic number.

It is not a de Polignac number, because 21329053 - 2¹ = 21329051 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21329051) 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 in 3 ways as a sum of consecutive naturals, for example, 45538 + ... + 46003.

It is an arithmetic number, because the mean of its divisors is an integer number (5355207).

Almost surely, 2^21329053 is an apocalyptic number.

It is an amenable number.

21329053 is a deficient number, since it is larger than the sum of its proper divisors (91775).

21329053 is an equidigital number, since it uses as much as digits as its factorization.

21329053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91774.

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 21329053 is about 4618.3387705971. The cubic root of 21329053 is about 277.3259596410.

The spelling of 21329053 in words is "twenty-one million, three hundred twenty-nine thousand, fifty-three".