210220121 has 4 divisors (see below), whose sum is σ = 210480144. Its totient is φ = 209960100.

The previous prime is 210220111. The next prime is 210220151. The reversal of 210220121 is 121022012.

It is a happy number.

210220121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 210220121 - 2²⁶ = 143111257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (210220111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128795 + ... + 130416.

It is an arithmetic number, because the mean of its divisors is an integer number (52620036).

Almost surely, 2^210220121 is an apocalyptic number.

It is an amenable number.

210220121 is a deficient number, since it is larger than the sum of its proper divisors (260023).

210220121 is an equidigital number, since it uses as much as digits as its factorization.

210220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260022.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 210220121 is about 14498.9696530478. The cubic root of 210220121 is about 594.5998024451.

Adding to 210220121 its reverse (121022012), we get a palindrome (331242133).

The spelling of 210220121 in words is "two hundred ten million, two hundred twenty thousand, one hundred twenty-one".