21019067 has 2 divisors, whose sum is σ = 21019068. Its totient is φ = 21019066.

The previous prime is 21019043. The next prime is 21019069. The reversal of 21019067 is 76091012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21019067 - 2¹⁰ = 21018043 is a prime.

Together with 21019069, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21019069) 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, 10509533 + 10509534.

It is an arithmetic number, because the mean of its divisors is an integer number (10509534).

Almost surely, 2^21019067 is an apocalyptic number.

21019067 is a deficient number, since it is larger than the sum of its proper divisors (1).

21019067 is an equidigital number, since it uses as much as digits as its factorization.

21019067 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 756, while the sum is 26.

The square root of 21019067 is about 4584.6556032051. The cubic root of 21019067 is about 275.9758914390.

The spelling of 21019067 in words is "twenty-one million, nineteen thousand, sixty-seven".