21895267 has 2 divisors, whose sum is σ = 21895268. Its totient is φ = 21895266.

The previous prime is 21895229. The next prime is 21895273. The reversal of 21895267 is 76259812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21895267 - 2¹¹ = 21893219 is a prime.

It is not a weakly prime, because it can be changed into another prime (21895217) 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, 10947633 + 10947634.

It is an arithmetic number, because the mean of its divisors is an integer number (10947634).

Almost surely, 2^21895267 is an apocalyptic number.

21895267 is a deficient number, since it is larger than the sum of its proper divisors (1).

21895267 is an equidigital number, since it uses as much as digits as its factorization.

21895267 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 40.

The square root of 21895267 is about 4679.2378652939. The cubic root of 21895267 is about 279.7585801697.

The spelling of 21895267 in words is "twenty-one million, eight hundred ninety-five thousand, two hundred sixty-seven".