21095663 has 2 divisors, whose sum is σ = 21095664. Its totient is φ = 21095662.

The previous prime is 21095653. The next prime is 21095677. The reversal of 21095663 is 36659012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21095663 - 2¹⁶ = 21030127 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21095653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10547831 + 10547832.

It is an arithmetic number, because the mean of its divisors is an integer number (10547832).

Almost surely, 2^21095663 is an apocalyptic number.

21095663 is a deficient number, since it is larger than the sum of its proper divisors (1).

21095663 is an equidigital number, since it uses as much as digits as its factorization.

21095663 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 21095663 is about 4593.0015240581. The cubic root of 21095663 is about 276.3107148001.

The spelling of 21095663 in words is "twenty-one million, ninety-five thousand, six hundred sixty-three".