21010193 has 2 divisors, whose sum is σ = 21010194. Its totient is φ = 21010192.

The previous prime is 21010189. The next prime is 21010217. The reversal of 21010193 is 39101012.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14077504 + 6932689 = 3752^2 + 2633^2 .

It is a cyclic number.

It is not a de Polignac number, because 21010193 - 2² = 21010189 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (21010153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505096 + 10505097.

It is an arithmetic number, because the mean of its divisors is an integer number (10505097).

Almost surely, 2^21010193 is an apocalyptic number.

It is an amenable number.

21010193 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010193 is an equidigital number, since it uses as much as digits as its factorization.

21010193 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 21010193 is about 4583.6877075124. The cubic root of 21010193 is about 275.9370480594.

The spelling of 21010193 in words is "twenty-one million, ten thousand, one hundred ninety-three".