21310063 has 2 divisors, whose sum is σ = 21310064. Its totient is φ = 21310062.

The previous prime is 21310057. The next prime is 21310073. The reversal of 21310063 is 36001312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21310063 - 2²¹ = 19212911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21310043) 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, 10655031 + 10655032.

It is an arithmetic number, because the mean of its divisors is an integer number (10655032).

Almost surely, 2^21310063 is an apocalyptic number.

21310063 is a deficient number, since it is larger than the sum of its proper divisors (1).

21310063 is an equidigital number, since it uses as much as digits as its factorization.

21310063 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 21310063 is about 4616.2823787113. The cubic root of 21310063 is about 277.2436308771.

Adding to 21310063 its reverse (36001312), we get a palindrome (57311375).

The spelling of 21310063 in words is "twenty-one million, three hundred ten thousand, sixty-three".