202011121 has 4 divisors (see below), whose sum is σ = 217550452. Its totient is φ = 186471792.

The previous prime is 202011109. The next prime is 202011151. The reversal of 202011121 is 121110202.

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 103306896 + 98704225 = 10164^2 + 9935^2 .

It is not a de Polignac number, because 202011121 - 2²¹ = 199913969 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202011098 and 202011107.

It is not an unprimeable number, because it can be changed into a prime (202011151) 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, 7769646 + ... + 7769671.

It is an arithmetic number, because the mean of its divisors is an integer number (54387613).

Almost surely, 2^202011121 is an apocalyptic number.

It is an amenable number.

202011121 is a deficient number, since it is larger than the sum of its proper divisors (15539331).

202011121 is a wasteful number, since it uses less digits than its factorization.

202011121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15539330.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 202011121 is about 14213.0616335820. The cubic root of 202011121 is about 586.7571983151.

Adding to 202011121 its reverse (121110202), we get a palindrome (323121323).

The spelling of 202011121 in words is "two hundred two million, eleven thousand, one hundred twenty-one".