21283673 has 2 divisors, whose sum is σ = 21283674. Its totient is φ = 21283672.

The previous prime is 21283657. The next prime is 21283679. The reversal of 21283673 is 37638212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16386304 + 4897369 = 4048^2 + 2213^2 .

It is a cyclic number.

It is not a de Polignac number, because 21283673 - 2⁴ = 21283657 is a prime.

It is not a weakly prime, because it can be changed into another prime (21283679) 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, 10641836 + 10641837.

It is an arithmetic number, because the mean of its divisors is an integer number (10641837).

Almost surely, 2^21283673 is an apocalyptic number.

It is an amenable number.

21283673 is a deficient number, since it is larger than the sum of its proper divisors (1).

21283673 is an equidigital number, since it uses as much as digits as its factorization.

21283673 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 32.

The square root of 21283673 is about 4613.4231325557. The cubic root of 21283673 is about 277.1291390884.

The spelling of 21283673 in words is "twenty-one million, two hundred eighty-three thousand, six hundred seventy-three".