202002220121 has 6 divisors (see below), whose sum is σ = 218736132030. Its totient is φ = 186463587648.

The previous prime is 202002220087. The next prime is 202002220141. The reversal of 202002220121 is 121022200202.

It can be written as a sum of positive squares in 3 ways, for example, as 17725194496 + 184277025625 = 133136^2 + 429275^2 .

It is not a de Polignac number, because 202002220121 - 2³⁰ = 200928478297 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 202002220096 and 202002220105.

It is not an unprimeable number, because it can be changed into a prime (202002220141) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 597639536 + ... + 597639873.

It is an arithmetic number, because the mean of its divisors is an integer number (36456022005).

Almost surely, 2^202002220121 is an apocalyptic number.

It is an amenable number.

202002220121 is a deficient number, since it is larger than the sum of its proper divisors (16733911909).

202002220121 is a wasteful number, since it uses less digits than its factorization.

202002220121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1195279435 (or 1195279422 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 202002220121 its reverse (121022200202), we get a palindrome (323024420323).

The spelling of 202002220121 in words is "two hundred two billion, two million, two hundred twenty thousand, one hundred twenty-one".