202331210212121 has 4 divisors (see below), whose sum is σ = 202798487834292. Its totient is φ = 201863932589952.

The previous prime is 202331210212031. The next prime is 202331210212207. The reversal of 202331210212121 is 121212012133202.

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 88435592160400 + 113895618051721 = 9404020^2 + 10672189^2 .

It is a cyclic number.

It is not a de Polignac number, because 202331210212121 - 2¹⁸ = 202331209949977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (202331210212921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 233638810436 + ... + 233638811301.

It is an arithmetic number, because the mean of its divisors is an integer number (50699621958573).

Almost surely, 2^{202331210212121} is an apocalyptic number.

It is an amenable number.

202331210212121 is a deficient number, since it is larger than the sum of its proper divisors (467277622171).

202331210212121 is an equidigital number, since it uses as much as digits as its factorization.

202331210212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467277622170.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 202331210212121 its reverse (121212012133202), we get a palindrome (323543222345323).

The spelling of 202331210212121 in words is "two hundred two trillion, three hundred thirty-one billion, two hundred ten million, two hundred twelve thousand, one hundred twenty-one".