2211111231 has 48 divisors (see below), whose sum is σ = 3539902464. Its totient is φ = 1223159616.

The previous prime is 2211111209. The next prime is 2211111289. The reversal of 2211111231 is 1321111122.

It is not a de Polignac number, because 2211111231 - 2⁶ = 2211111167 is a prime.

It is a super-2 number, since 2×2211111231² = 9778025751708670722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2211111231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2211111431) 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 in 47 ways as a sum of consecutive naturals, for example, 1211986 + ... + 1213808.

It is an arithmetic number, because the mean of its divisors is an integer number (73747968).

Almost surely, 2^2211111231 is an apocalyptic number.

2211111231 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2211111231 is a deficient number, since it is larger than the sum of its proper divisors (1328791233).

2211111231 is a wasteful number, since it uses less digits than its factorization.

2211111231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2100 (or 2093 counting only the distinct ones).

The product of its digits is 24, while the sum is 15.

The square root of 2211111231 is about 47022.4545403576. The cubic root of 2211111231 is about 1302.7773424881. Note that the first 3 decimals are identical.

Adding to 2211111231 its reverse (1321111122), we get a palindrome (3532222353).

The spelling of 2211111231 in words is "two billion, two hundred eleven million, one hundred eleven thousand, two hundred thirty-one".