21067099 has 2 divisors, whose sum is σ = 21067100. Its totient is φ = 21067098.

The previous prime is 21067087. The next prime is 21067117. The reversal of 21067099 is 99076012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21067099 - 2¹³ = 21058907 is a prime.

It is not a weakly prime, because it can be changed into another prime (21067019) 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, 10533549 + 10533550.

It is an arithmetic number, because the mean of its divisors is an integer number (10533550).

Almost surely, 2^21067099 is an apocalyptic number.

21067099 is a deficient number, since it is larger than the sum of its proper divisors (1).

21067099 is an equidigital number, since it uses as much as digits as its factorization.

21067099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 21067099 is about 4589.8909573104. The cubic root of 21067099 is about 276.1859481728.

The spelling of 21067099 in words is "twenty-one million, sixty-seven thousand, ninety-nine".