21338713 has 6 divisors (see below), whose sum is σ = 23455082. Its totient is φ = 19398720.

The previous prime is 21338683. The next prime is 21338717. The reversal of 21338713 is 31783312.

It can be written as a sum of positive squares in only one way, i.e., 18688329 + 2650384 = 4323^2 + 1628^2 .

It is not a de Polignac number, because 21338713 - 2²¹ = 19241561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21338717) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 88056 + ... + 88297.

Almost surely, 2^21338713 is an apocalyptic number.

It is an amenable number.

21338713 is a deficient number, since it is larger than the sum of its proper divisors (2116369).

21338713 is a wasteful number, since it uses less digits than its factorization.

21338713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176375 (or 176364 counting only the distinct ones).

The product of its digits is 3024, while the sum is 28.

The square root of 21338713 is about 4619.3844828072. The cubic root of 21338713 is about 277.3678206093.

The spelling of 21338713 in words is "twenty-one million, three hundred thirty-eight thousand, seven hundred thirteen".