21346673 has 2 divisors, whose sum is σ = 21346674. Its totient is φ = 21346672.

The previous prime is 21346667. The next prime is 21346681. The reversal of 21346673 is 37664312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16581184 + 4765489 = 4072^2 + 2183^2 .

It is a cyclic number.

It is not a de Polignac number, because 21346673 - 2⁴ = 21346657 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (21346573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10673336 + 10673337.

It is an arithmetic number, because the mean of its divisors is an integer number (10673337).

Almost surely, 2^21346673 is an apocalyptic number.

It is an amenable number.

21346673 is a deficient number, since it is larger than the sum of its proper divisors (1).

21346673 is an equidigital number, since it uses as much as digits as its factorization.

21346673 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 32.

The square root of 21346673 is about 4620.2459891222. The cubic root of 21346673 is about 277.4023052472.

The spelling of 21346673 in words is "twenty-one million, three hundred forty-six thousand, six hundred seventy-three".