21330053 has 16 divisors (see below), whose sum is σ = 23373504. Its totient is φ = 19388160.

The previous prime is 21330047. The next prime is 21330059. The reversal of 21330053 is 35003312.

It is an interprime number because it is at equal distance from previous prime (21330047) and next prime (21330059).

It is not a de Polignac number, because 21330053 - 2¹⁰ = 21329029 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21330059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69326 + ... + 69632.

It is an arithmetic number, because the mean of its divisors is an integer number (1460844).

Almost surely, 2^21330053 is an apocalyptic number.

It is an amenable number.

21330053 is a deficient number, since it is larger than the sum of its proper divisors (2043451).

21330053 is a wasteful number, since it uses less digits than its factorization.

21330053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452.

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

The square root of 21330053 is about 4618.4470333652. The cubic root of 21330053 is about 277.3302936610.

Adding to 21330053 its reverse (35003312), we get a palindrome (56333365).

The spelling of 21330053 in words is "twenty-one million, three hundred thirty thousand, fifty-three".