21303713 has 2 divisors, whose sum is σ = 21303714. Its totient is φ = 21303712.

The previous prime is 21303707. The next prime is 21303757. The reversal of 21303713 is 31730312.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20857489 + 446224 = 4567^2 + 668^2 .

It is a cyclic number.

It is not a de Polignac number, because 21303713 - 2⁴ = 21303697 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21306713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10651856 + 10651857.

It is an arithmetic number, because the mean of its divisors is an integer number (10651857).

Almost surely, 2^21303713 is an apocalyptic number.

It is an amenable number.

21303713 is a deficient number, since it is larger than the sum of its proper divisors (1).

21303713 is an equidigital number, since it uses as much as digits as its factorization.

21303713 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 378, while the sum is 20.

The square root of 21303713 is about 4615.5945445847. The cubic root of 21303713 is about 277.2160903367.

It can be divided in two parts, 213037 and 13, that multiplied together give a triangular number (2769481 = T₂₃₅₃).

The spelling of 21303713 in words is "twenty-one million, three hundred three thousand, seven hundred thirteen".