210221199893 has 2 divisors, whose sum is σ = 210221199894. Its totient is φ = 210221199892.

The previous prime is 210221199857. The next prime is 210221199959. The reversal of 210221199893 is 398991122012.

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., 208759437604 + 1461762289 = 456902^2 + 38233^2 .

It is a cyclic number.

It is not a de Polignac number, because 210221199893 - 2⁶ = 210221199829 is a prime.

It is a super-2 number, since 2×210221199893² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210221199193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105110599946 + 105110599947.

It is an arithmetic number, because the mean of its divisors is an integer number (105110599947).

Almost surely, 2^210221199893 is an apocalyptic number.

It is an amenable number.

210221199893 is a deficient number, since it is larger than the sum of its proper divisors (1).

210221199893 is an equidigital number, since it uses as much as digits as its factorization.

210221199893 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 47.

The spelling of 210221199893 in words is "two hundred ten billion, two hundred twenty-one million, one hundred ninety-nine thousand, eight hundred ninety-three".