202120323121 has 4 divisors (see below), whose sum is σ = 202289746212. Its totient is φ = 201950900032.

The previous prime is 202120323061. The next prime is 202120323127. The reversal of 202120323121 is 121323021202.

202120323121 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 160784960400 + 41335362721 = 400980^2 + 203311^2 .

It is a cyclic number.

It is not a de Polignac number, because 202120323121 - 2²⁹ = 201583452209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (202120323127) 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, 84709756 + ... + 84712141.

It is an arithmetic number, because the mean of its divisors is an integer number (50572436553).

Almost surely, 2^202120323121 is an apocalyptic number.

It is an amenable number.

202120323121 is a deficient number, since it is larger than the sum of its proper divisors (169423091).

202120323121 is a wasteful number, since it uses less digits than its factorization.

202120323121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169423090.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 202120323121 its reverse (121323021202), we get a palindrome (323443344323).

The spelling of 202120323121 in words is "two hundred two billion, one hundred twenty million, three hundred twenty-three thousand, one hundred twenty-one".