221111131 has 2 divisors, whose sum is σ = 221111132. Its totient is φ = 221111130.

The previous prime is 221111123. The next prime is 221111141. The reversal of 221111131 is 131111122.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221111131 - 2³ = 221111123 is a prime.

It is a super-2 number, since 2×221111131² = 97780264504198322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221111141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110555565 + 110555566.

It is an arithmetic number, because the mean of its divisors is an integer number (110555566).

Almost surely, 2^221111131 is an apocalyptic number.

221111131 is a deficient number, since it is larger than the sum of its proper divisors (1).

221111131 is an equidigital number, since it uses as much as digits as its factorization.

221111131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12, while the sum is 13.

The square root of 221111131 is about 14869.8060175646. The cubic root of 221111131 is about 604.6956837593.

Adding to 221111131 its reverse (131111122), we get a palindrome (352222253).

Subtracting from 221111131 its reverse (131111122), we obtain a palindrome (90000009).

The spelling of 221111131 in words is "two hundred twenty-one million, one hundred eleven thousand, one hundred thirty-one".