223131122321 has 2 divisors, whose sum is σ = 223131122322. Its totient is φ = 223131122320.

The previous prime is 223131122297. The next prime is 223131122387. The reversal of 223131122321 is 123221131322.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 221803321600 + 1327800721 = 470960^2 + 36439^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-223131122321 is a prime.

It is a super-3 number, since 3×223131122321³ (a number of 35 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (223131128321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111565561160 + 111565561161.

It is an arithmetic number, because the mean of its divisors is an integer number (111565561161).

Almost surely, 2^223131122321 is an apocalyptic number.

It is an amenable number.

223131122321 is a deficient number, since it is larger than the sum of its proper divisors (1).

223131122321 is an equidigital number, since it uses as much as digits as its factorization.

223131122321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 23.

Adding to 223131122321 its reverse (123221131322), we get a palindrome (346352253643).

Subtracting from 223131122321 its reverse (123221131322), we obtain a palindrome (99909990999).

The spelling of 223131122321 in words is "two hundred twenty-three billion, one hundred thirty-one million, one hundred twenty-two thousand, three hundred twenty-one".