202131223321 has 2 divisors, whose sum is σ = 202131223322. Its totient is φ = 202131223320.

The previous prime is 202131223319. The next prime is 202131223331. The reversal of 202131223321 is 123322131202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160048803721 + 42082419600 = 400061^2 + 205140^2 .

It is a cyclic number.

It is not a de Polignac number, because 202131223321 - 2¹ = 202131223319 is a prime.

Together with 202131223319, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 202131223292 and 202131223301.

It is not a weakly prime, because it can be changed into another prime (202131223331) 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 as a sum of consecutive naturals, namely, 101065611660 + 101065611661.

It is an arithmetic number, because the mean of its divisors is an integer number (101065611661).

Almost surely, 2^202131223321 is an apocalyptic number.

It is an amenable number.

202131223321 is a deficient number, since it is larger than the sum of its proper divisors (1).

202131223321 is an equidigital number, since it uses as much as digits as its factorization.

202131223321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 202131223321 its reverse (123322131202), we get a palindrome (325453354523).

The spelling of 202131223321 in words is "two hundred two billion, one hundred thirty-one million, two hundred twenty-three thousand, three hundred twenty-one".