21095927 has 2 divisors, whose sum is σ = 21095928. Its totient is φ = 21095926.

The previous prime is 21095911. The next prime is 21095939. The reversal of 21095927 is 72959012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21095927 - 2⁴ = 21095911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21095027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10547963 + 10547964.

It is an arithmetic number, because the mean of its divisors is an integer number (10547964).

Almost surely, 2^21095927 is an apocalyptic number.

21095927 is a deficient number, since it is larger than the sum of its proper divisors (1).

21095927 is an equidigital number, since it uses as much as digits as its factorization.

21095927 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11340, while the sum is 35.

The square root of 21095927 is about 4593.0302633447. The cubic root of 21095927 is about 276.3118674181.

It can be divided in two parts, 21095 and 927, that added together give a palindrome (22022).

The spelling of 21095927 in words is "twenty-one million, ninety-five thousand, nine hundred twenty-seven".