202011122121 has 16 divisors (see below), whose sum is σ = 272616206400. Its totient is φ = 133042745088.

The previous prime is 202011122083. The next prime is 202011122129. The reversal of 202011122121 is 121221110202.

It is not a de Polignac number, because 202011122121 - 2¹⁵ = 202011089353 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 202011122121.

It is not an unprimeable number, because it can be changed into a prime (202011122129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33631 + ... + 636516.

It is an arithmetic number, because the mean of its divisors is an integer number (17038512900).

Almost surely, 2^202011122121 is an apocalyptic number.

It is an amenable number.

202011122121 is a deficient number, since it is larger than the sum of its proper divisors (70605084279).

202011122121 is a wasteful number, since it uses less digits than its factorization.

202011122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 671368.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 202011122121 its reverse (121221110202), we get a palindrome (323232232323).

The spelling of 202011122121 in words is "two hundred two billion, eleven million, one hundred twenty-two thousand, one hundred twenty-one".