21067 has 2 divisors, whose sum is σ = 21068. Its totient is φ = 21066.

The previous prime is 21061. The next prime is 21089. The reversal of 21067 is 76012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21067 - 2³ = 21059 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21067.

It is not a weakly prime, because it can be changed into another prime (21061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10533 + 10534.

It is an arithmetic number, because the mean of its divisors is an integer number (10534).

2²¹⁰⁶⁷ is an apocalyptic number.

21067 is a deficient number, since it is larger than the sum of its proper divisors (1).

21067 is an equidigital number, since it uses as much as digits as its factorization.

21067 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 21067 is about 145.1447553307. The cubic root of 21067 is about 27.6185515548.

Adding to 21067 its reverse (76012), we get a palindrome (97079).

Subtracting 21067 from its reverse (76012), we obtain a palindrome (54945).

The spelling of 21067 in words is "twenty-one thousand, sixty-seven".