202002202020121 has 4 divisors (see below), whose sum is σ = 202002523523892. Its totient is φ = 202001880516352.

The previous prime is 202002202020109. The next prime is 202002202020127. The reversal of 202002202020121 is 121020202200202.

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 84891604304896 + 117110597715225 = 9213664^2 + 10821765^2 .

It is a cyclic number.

It is not a de Polignac number, because 202002202020121 - 2²⁹ = 202001665149209 is a prime.

It is a super-2 number, since 2×202002202020121² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202002202020095 and 202002202020104.

It is not an unprimeable number, because it can be changed into a prime (202002202020127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 159807580 + ... + 161066653.

It is an arithmetic number, because the mean of its divisors is an integer number (50500630880973).

Almost surely, 2^{202002202020121} is an apocalyptic number.

It is an amenable number.

202002202020121 is a deficient number, since it is larger than the sum of its proper divisors (321503771).

202002202020121 is an equidigital number, since it uses as much as digits as its factorization.

202002202020121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321503770.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 202002202020121 its reverse (121020202200202), we get a palindrome (323022404220323).

The spelling of 202002202020121 in words is "two hundred two trillion, two billion, two hundred two million, twenty thousand, one hundred twenty-one".