210121223 has 16 divisors (see below), whose sum is σ = 230425440. Its totient is φ = 190439424.

The previous prime is 210121217. The next prime is 210121259. The reversal of 210121223 is 322121012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 210121223 - 2⁶ = 210121159 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210121198 and 210121207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210121283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 207743 + ... + 208751.

It is an arithmetic number, because the mean of its divisors is an integer number (14401590).

Almost surely, 2^210121223 is an apocalyptic number.

210121223 is a deficient number, since it is larger than the sum of its proper divisors (20304217).

210121223 is a wasteful number, since it uses less digits than its factorization.

210121223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1298.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 210121223 is about 14495.5587336260. The cubic root of 210121223 is about 594.5065447130.

Adding to 210121223 its reverse (322121012), we get a palindrome (532242235).

The spelling of 210121223 in words is "two hundred ten million, one hundred twenty-one thousand, two hundred twenty-three".