21267067 has 2 divisors, whose sum is σ = 21267068. Its totient is φ = 21267066.

The previous prime is 21267053. The next prime is 21267079. The reversal of 21267067 is 76076212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21267067 - 2¹⁵ = 21234299 is a prime.

It is not a weakly prime, because it can be changed into another prime (21267047) 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, 10633533 + 10633534.

It is an arithmetic number, because the mean of its divisors is an integer number (10633534).

Almost surely, 2^21267067 is an apocalyptic number.

21267067 is a deficient number, since it is larger than the sum of its proper divisors (1).

21267067 is an equidigital number, since it uses as much as digits as its factorization.

21267067 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 21267067 is about 4611.6230331631. The cubic root of 21267067 is about 277.0570462082.

The spelling of 21267067 in words is "twenty-one million, two hundred sixty-seven thousand, sixty-seven".