221031231011 has 2 divisors, whose sum is σ = 221031231012. Its totient is φ = 221031231010.

The previous prime is 221031230963. The next prime is 221031231013. The reversal of 221031231011 is 110132130122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221031231011 - 2¹⁴ = 221031214627 is a prime.

Together with 221031231013, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (221031231013) 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, 110515615505 + 110515615506.

It is an arithmetic number, because the mean of its divisors is an integer number (110515615506).

Almost surely, 2^221031231011 is an apocalyptic number.

221031231011 is a deficient number, since it is larger than the sum of its proper divisors (1).

221031231011 is an equidigital number, since it uses as much as digits as its factorization.

221031231011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 221031231011 its reverse (110132130122), we get a palindrome (331163361133).

The spelling of 221031231011 in words is "two hundred twenty-one billion, thirty-one million, two hundred thirty-one thousand, eleven".