202012021121 has 4 divisors (see below), whose sum is σ = 204012140244. Its totient is φ = 200011902000.

The previous prime is 202012021117. The next prime is 202012021163. The reversal of 202012021121 is 121120210202.

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 173023553521 + 28988467600 = 415961^2 + 170260^2 .

It is a cyclic number.

It is not a de Polignac number, because 202012021121 - 2² = 202012021117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 202012021096 and 202012021105.

It is not an unprimeable number, because it can be changed into a prime (202012021171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1000059410 + ... + 1000059611.

It is an arithmetic number, because the mean of its divisors is an integer number (51003035061).

Almost surely, 2^202012021121 is an apocalyptic number.

It is an amenable number.

202012021121 is a deficient number, since it is larger than the sum of its proper divisors (2000119123).

202012021121 is a wasteful number, since it uses less digits than its factorization.

202012021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2000119122.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 202012021121 its reverse (121120210202), we get a palindrome (323132231323).

The spelling of 202012021121 in words is "two hundred two billion, twelve million, twenty-one thousand, one hundred twenty-one".