210021201121 has 4 divisors (see below), whose sum is σ = 210938324500. Its totient is φ = 209104077744.

The previous prime is 210021201101. The next prime is 210021201139. The reversal of 210021201121 is 121102120012.

210021201121 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.

It can be written as a sum of positive squares in 2 ways, for example, as 103066039521 + 106955161600 = 321039^2 + 327040^2 .

It is a cyclic number.

It is not a de Polignac number, because 210021201121 - 2²⁷ = 209886983393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (210021201101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 458561346 + ... + 458561803.

It is an arithmetic number, because the mean of its divisors is an integer number (52734581125).

Almost surely, 2^210021201121 is an apocalyptic number.

It is an amenable number.

210021201121 is a deficient number, since it is larger than the sum of its proper divisors (917123379).

210021201121 is an equidigital number, since it uses as much as digits as its factorization.

210021201121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 917123378.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 210021201121 its reverse (121102120012), we get a palindrome (331123321133).

The spelling of 210021201121 in words is "two hundred ten billion, twenty-one million, two hundred one thousand, one hundred twenty-one".