210221123221 has 8 divisors (see below), whose sum is σ = 217548185400. Its totient is φ = 202899264960.

The previous prime is 210221123201. The next prime is 210221123227. The reversal of 210221123221 is 122321122012.

210221123221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 28328256100 + 181892867121 = 168310^2 + 426489^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 210221123221 - 2²⁷ = 210086905493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210221123227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1218690 + ... + 1380451.

It is an arithmetic number, because the mean of its divisors is an integer number (27193523175).

Almost surely, 2^210221123221 is an apocalyptic number.

It is an amenable number.

210221123221 is a deficient number, since it is larger than the sum of its proper divisors (7327062179).

210221123221 is a wasteful number, since it uses less digits than its factorization.

210221123221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2601959.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 210221123221 its reverse (122321122012), we get a palindrome (332542245233).

The spelling of 210221123221 in words is "two hundred ten billion, two hundred twenty-one million, one hundred twenty-three thousand, two hundred twenty-one".