21110093 has 2 divisors, whose sum is σ = 21110094. Its totient is φ = 21110092.

The previous prime is 21110071. The next prime is 21110099. The reversal of 21110093 is 39001112.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17197609 + 3912484 = 4147^2 + 1978^2 .

It is a cyclic number.

It is not a de Polignac number, because 21110093 - 2⁶ = 21110029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21110099) 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, 10555046 + 10555047.

It is an arithmetic number, because the mean of its divisors is an integer number (10555047).

Almost surely, 2^21110093 is an apocalyptic number.

It is an amenable number.

21110093 is a deficient number, since it is larger than the sum of its proper divisors (1).

21110093 is an equidigital number, since it uses as much as digits as its factorization.

21110093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54, while the sum is 17.

The square root of 21110093 is about 4594.5721237129. The cubic root of 21110093 is about 276.3737017570.

The spelling of 21110093 in words is "twenty-one million, one hundred ten thousand, ninety-three".