201321311231 has 2 divisors, whose sum is σ = 201321311232. Its totient is φ = 201321311230.

The previous prime is 201321311189. The next prime is 201321311251. The reversal of 201321311231 is 132113123102.

It is a happy number.

It is an a-pointer prime, because the next prime (201321311251) can be obtained adding 201321311231 to its sum of digits (20).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 201321311231 - 2²⁶ = 201254202367 is a prime.

It is a super-2 number, since 2×201321311231² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201321311251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100660655615 + 100660655616.

It is an arithmetic number, because the mean of its divisors is an integer number (100660655616).

Almost surely, 2^201321311231 is an apocalyptic number.

201321311231 is a deficient number, since it is larger than the sum of its proper divisors (1).

201321311231 is an equidigital number, since it uses as much as digits as its factorization.

201321311231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 201321311231 its reverse (132113123102), we get a palindrome (333434434333).

The spelling of 201321311231 in words is "two hundred one billion, three hundred twenty-one million, three hundred eleven thousand, two hundred thirty-one".