210121121 has 8 divisors (see below), whose sum is σ = 240363840. Its totient is φ = 179934768.

The previous prime is 210121103. The next prime is 210121151. The reversal of 210121121 is 121121012.

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 210121121 - 2¹⁸ = 209858977 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (210121151) 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 7 ways as a sum of consecutive naturals, for example, 5771 + ... + 21296.

It is an arithmetic number, because the mean of its divisors is an integer number (30045480).

Almost surely, 2^210121121 is an apocalyptic number.

It is an amenable number.

210121121 is a deficient number, since it is larger than the sum of its proper divisors (30242719).

210121121 is a wasteful number, since it uses less digits than its factorization.

210121121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28183.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 210121121 is about 14495.5552153065. Note that the first 3 decimals coincide. The cubic root of 210121121 is about 594.5064485150.

Adding to 210121121 its reverse (121121012), we get a palindrome (331242133).

The spelling of 210121121 in words is "two hundred ten million, one hundred twenty-one thousand, one hundred twenty-one".