21195767 has 2 divisors, whose sum is σ = 21195768. Its totient is φ = 21195766.

The previous prime is 21195751. The next prime is 21195791. The reversal of 21195767 is 76759112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21195767 - 2⁴ = 21195751 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21195767.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21195367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10597883 + 10597884.

It is an arithmetic number, because the mean of its divisors is an integer number (10597884).

Almost surely, 2^21195767 is an apocalyptic number.

21195767 is a deficient number, since it is larger than the sum of its proper divisors (1).

21195767 is an equidigital number, since it uses as much as digits as its factorization.

21195767 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26460, while the sum is 38.

The square root of 21195767 is about 4603.8860759146. The cubic root of 21195767 is about 276.7470789310.

The spelling of 21195767 in words is "twenty-one million, one hundred ninety-five thousand, seven hundred sixty-seven".