21600673 has 2 divisors, whose sum is σ = 21600674. Its totient is φ = 21600672.

The previous prime is 21600647. The next prime is 21600743. The reversal of 21600673 is 37600612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16064064 + 5536609 = 4008^2 + 2353^2 .

It is a cyclic number.

It is not a de Polignac number, because 21600673 - 2⁵ = 21600641 is a prime.

It is not a weakly prime, because it can be changed into another prime (21600613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10800336 + 10800337.

It is an arithmetic number, because the mean of its divisors is an integer number (10800337).

Almost surely, 2^21600673 is an apocalyptic number.

It is an amenable number.

21600673 is a deficient number, since it is larger than the sum of its proper divisors (1).

21600673 is an equidigital number, since it uses as much as digits as its factorization.

21600673 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 21600673 is about 4647.6524181569. The cubic root of 21600673 is about 278.4982223842.

The spelling of 21600673 in words is "twenty-one million, six hundred thousand, six hundred seventy-three".