21313063 has 2 divisors, whose sum is σ = 21313064. Its totient is φ = 21313062.

The previous prime is 21313037. The next prime is 21313091. The reversal of 21313063 is 36031312.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21313063 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21313063.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21313093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10656531 + 10656532.

It is an arithmetic number, because the mean of its divisors is an integer number (10656532).

Almost surely, 2^21313063 is an apocalyptic number.

21313063 is a deficient number, since it is larger than the sum of its proper divisors (1).

21313063 is an equidigital number, since it uses as much as digits as its factorization.

21313063 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 19.

The square root of 21313063 is about 4616.6073040708. The cubic root of 21313063 is about 277.2566402531.

Adding to 21313063 its reverse (36031312), we get a palindrome (57344375).

The spelling of 21313063 in words is "twenty-one million, three hundred thirteen thousand, sixty-three".