201221110031 has 2 divisors, whose sum is σ = 201221110032. Its totient is φ = 201221110030.

The previous prime is 201221110021. The next prime is 201221110033. The reversal of 201221110031 is 130011122102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 201221110031 - 2⁶ = 201221109967 is a prime.

It is a super-2 number, since 2×201221110031² (a number of 23 digits) contains 22 as substring.

Together with 201221110033, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 201221109988 and 201221110015.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201221110033) 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, 100610555015 + 100610555016.

It is an arithmetic number, because the mean of its divisors is an integer number (100610555016).

Almost surely, 2^201221110031 is an apocalyptic number.

201221110031 is a deficient number, since it is larger than the sum of its proper divisors (1).

201221110031 is an equidigital number, since it uses as much as digits as its factorization.

201221110031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 201221110031 its reverse (130011122102), we get a palindrome (331232232133).

The spelling of 201221110031 in words is "two hundred one billion, two hundred twenty-one million, one hundred ten thousand, thirty-one".