21283679 has 2 divisors, whose sum is σ = 21283680. Its totient is φ = 21283678.

The previous prime is 21283673. The next prime is 21283699. The reversal of 21283679 is 97638212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21283679 - 2¹⁶ = 21218143 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21283673) 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, 10641839 + 10641840.

It is an arithmetic number, because the mean of its divisors is an integer number (10641840).

Almost surely, 2^21283679 is an apocalyptic number.

21283679 is a deficient number, since it is larger than the sum of its proper divisors (1).

21283679 is an equidigital number, since it uses as much as digits as its factorization.

21283679 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 38.

The square root of 21283679 is about 4613.4237828320. The cubic root of 21283679 is about 277.1291651299.

The spelling of 21283679 in words is "twenty-one million, two hundred eighty-three thousand, six hundred seventy-nine".