202121020121 has 8 divisors (see below), whose sum is σ = 209845558920. Its totient is φ = 194446804608.

The previous prime is 202121020099. The next prime is 202121020159. The reversal of 202121020121 is 121020121202.

202121020121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 14514225625 + 187606794496 = 120475^2 + 433136^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 202121020121 - 2¹⁰ = 202121019097 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 = 202121020096 and 202121020105.

It is not an unprimeable number, because it can be changed into a prime (202121020921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12572636 + ... + 12588701.

It is an arithmetic number, because the mean of its divisors is an integer number (26230694865).

Almost surely, 2^202121020121 is an apocalyptic number.

It is an amenable number.

202121020121 is a deficient number, since it is larger than the sum of its proper divisors (7724538799).

202121020121 is a wasteful number, since it uses less digits than its factorization.

202121020121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25161643.

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

Adding to 202121020121 its reverse (121020121202), we get a palindrome (323141141323).

It can be divided in two parts, 202 and 121020121, that multiplied together give a palindrome (24446064442).

The spelling of 202121020121 in words is "two hundred two billion, one hundred twenty-one million, twenty thousand, one hundred twenty-one".