210122221 has 8 divisors (see below), whose sum is σ = 211333304. Its totient is φ = 208915200.

The previous prime is 210122207. The next prime is 210122279. The reversal of 210122221 is 122221012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 741321 + 209380900 = 861^2 + 14470^2 .

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 210122221 - 2⁵ = 210122189 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 (210122201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 187555 + ... + 188671.

It is an arithmetic number, because the mean of its divisors is an integer number (26416663).

Almost surely, 2^210122221 is an apocalyptic number.

It is an amenable number.

210122221 is a deficient number, since it is larger than the sum of its proper divisors (1211083).

210122221 is a wasteful number, since it uses less digits than its factorization.

210122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2031.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 210122221 is about 14495.5931579222. The cubic root of 210122221 is about 594.5074859420.

Adding to 210122221 its reverse (122221012), we get a palindrome (332343233).

The spelling of 210122221 in words is "two hundred ten million, one hundred twenty-two thousand, two hundred twenty-one".