21600713 has 4 divisors (see below), whose sum is σ = 21611460. Its totient is φ = 21589968.

The previous prime is 21600673. The next prime is 21600743. The reversal of 21600713 is 31700612.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 182329 + 21418384 = 427^2 + 4628^2 .

It is a cyclic number.

It is not a de Polignac number, because 21600713 - 2²⁰ = 20552137 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21600743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1358 + ... + 6711.

It is an arithmetic number, because the mean of its divisors is an integer number (5402865).

Almost surely, 2^21600713 is an apocalyptic number.

It is an amenable number.

21600713 is a deficient number, since it is larger than the sum of its proper divisors (10747).

21600713 is an equidigital number, since it uses as much as digits as its factorization.

21600713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10746.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 21600713 is about 4647.6567214027. The cubic root of 21600713 is about 278.4983942912.

The spelling of 21600713 in words is "twenty-one million, six hundred thousand, seven hundred thirteen".