202000121 has 4 divisors (see below), whose sum is σ = 202355700. Its totient is φ = 201644544.

The previous prime is 202000093. The next prime is 202000147. The reversal of 202000121 is 121000202.

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 25110121 + 176890000 = 5011^2 + 13300^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-202000121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202000099 and 202000108.

It is not an unprimeable number, because it can be changed into a prime (202000021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 176936 + ... + 178073.

It is an arithmetic number, because the mean of its divisors is an integer number (50588925).

Almost surely, 2^202000121 is an apocalyptic number.

It is an amenable number.

202000121 is a deficient number, since it is larger than the sum of its proper divisors (355579).

202000121 is an equidigital number, since it uses as much as digits as its factorization.

202000121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355578.

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

The square root of 202000121 is about 14212.6746603164. The cubic root of 202000121 is about 586.7465479999.

Adding to 202000121 its reverse (121000202), we get a palindrome (323000323).

The spelling of 202000121 in words is "two hundred two million, one hundred twenty-one", and thus it is an aban number.