21052063 has 2 divisors, whose sum is σ = 21052064. Its totient is φ = 21052062.

The previous prime is 21052051. The next prime is 21052079. The reversal of 21052063 is 36025012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21052063 - 2¹³ = 21043871 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21052063.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21052043) 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, 10526031 + 10526032.

It is an arithmetic number, because the mean of its divisors is an integer number (10526032).

Almost surely, 2^21052063 is an apocalyptic number.

21052063 is a deficient number, since it is larger than the sum of its proper divisors (1).

21052063 is an equidigital number, since it uses as much as digits as its factorization.

21052063 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 21052063 is about 4588.2527175386. The cubic root of 21052063 is about 276.1202260996.

Adding to 21052063 its reverse (36025012), we get a palindrome (57077075).

The spelling of 21052063 in words is "twenty-one million, fifty-two thousand, sixty-three".