210121230 has 32 divisors (see below), whose sum is σ = 550136448. Its totient is φ = 50938400.

The previous prime is 210121217. The next prime is 210121259. The reversal of 210121230 is 32121012.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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, 318036 + ... + 318695.

It is an arithmetic number, because the mean of its divisors is an integer number (17191764).

Almost surely, 2^210121230 is an apocalyptic number.

210121230 is an abundant number, since it is smaller than the sum of its proper divisors (340015218).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

210121230 is a wasteful number, since it uses less digits than its factorization.

210121230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636752.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 210121230 is about 14495.5589750792. The cubic root of 210121230 is about 594.5065513148.

Adding to 210121230 its reverse (32121012), we get a palindrome (242242242).

The spelling of 210121230 in words is "two hundred ten million, one hundred twenty-one thousand, two hundred thirty".