210221093 has 4 divisors (see below), whose sum is σ = 213100908. Its totient is φ = 207341280.

The previous prime is 210221069. The next prime is 210221101. The reversal of 210221093 is 390122012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 81126049 + 129095044 = 9007^2 + 11362^2 .

It is a cyclic number.

It is not a de Polignac number, because 210221093 - 2¹⁶ = 210155557 is a prime.

It is a super-2 number, since 2×210221093² = 88385815884229298, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210221003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1439798 + ... + 1439943.

It is an arithmetic number, because the mean of its divisors is an integer number (53275227).

Almost surely, 2^210221093 is an apocalyptic number.

It is an amenable number.

210221093 is a deficient number, since it is larger than the sum of its proper divisors (2879815).

210221093 is an equidigital number, since it uses as much as digits as its factorization.

210221093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2879814.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 210221093 is about 14499.0031726322. The cubic root of 210221093 is about 594.6007188657.

The spelling of 210221093 in words is "two hundred ten million, two hundred twenty-one thousand, ninety-three".