21095693 has 2 divisors, whose sum is σ = 21095694. Its totient is φ = 21095692.

The previous prime is 21095677. The next prime is 21095699. The reversal of 21095693 is 39659012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11744329 + 9351364 = 3427^2 + 3058^2 .

It is a cyclic number.

It is not a de Polignac number, because 21095693 - 2⁴ = 21095677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21095699) 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, 10547846 + 10547847.

It is an arithmetic number, because the mean of its divisors is an integer number (10547847).

Almost surely, 2^21095693 is an apocalyptic number.

It is an amenable number.

21095693 is a deficient number, since it is larger than the sum of its proper divisors (1).

21095693 is an equidigital number, since it uses as much as digits as its factorization.

21095693 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14580, while the sum is 35.

The square root of 21095693 is about 4593.0047898952. The cubic root of 21095693 is about 276.3108457799.

The spelling of 21095693 in words is "twenty-one million, ninety-five thousand, six hundred ninety-three".