21052053 has 24 divisors (see below), whose sum is σ = 33324096. Its totient is φ = 12700800.

The previous prime is 21052051. The next prime is 21052063. The reversal of 21052053 is 35025012.

It is a happy number.

It is not a de Polignac number, because 21052053 - 2¹ = 21052051 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21052051) 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 23 ways as a sum of consecutive naturals, for example, 33048 + ... + 33678.

It is an arithmetic number, because the mean of its divisors is an integer number (1388504).

Almost surely, 2^21052053 is an apocalyptic number.

It is an amenable number.

21052053 is a deficient number, since it is larger than the sum of its proper divisors (12272043).

21052053 is a wasteful number, since it uses less digits than its factorization.

21052053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 985 (or 982 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 21052053 is about 4588.2516277990. The cubic root of 21052053 is about 276.1201823794.

Adding to 21052053 its reverse (35025012), we get a palindrome (56077065).

The spelling of 21052053 in words is "twenty-one million, fifty-two thousand, fifty-three".