21169367 has 2 divisors, whose sum is σ = 21169368. Its totient is φ = 21169366.

The previous prime is 21169331. The next prime is 21169381. The reversal of 21169367 is 76396112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21169367 - 2⁶ = 21169303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21169397) 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, 10584683 + 10584684.

It is an arithmetic number, because the mean of its divisors is an integer number (10584684).

Almost surely, 2^21169367 is an apocalyptic number.

21169367 is a deficient number, since it is larger than the sum of its proper divisors (1).

21169367 is an equidigital number, since it uses as much as digits as its factorization.

21169367 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608, while the sum is 35.

The square root of 21169367 is about 4601.0180395213. The cubic root of 21169367 is about 276.6321321066.

The spelling of 21169367 in words is "twenty-one million, one hundred sixty-nine thousand, three hundred sixty-seven".