1211112231 has 32 divisors (see below), whose sum is σ = 1995164160. Its totient is φ = 637911936.

The previous prime is 1211112229. The next prime is 1211112233. The reversal of 1211112231 is 1322111121.

1211112231 is nontrivially palindromic in base 6.

It is an interprime number because it is at equal distance from previous prime (1211112229) and next prime (1211112233).

It is not a de Polignac number, because 1211112231 - 2¹ = 1211112229 is a prime.

It is a super-2 number, since 2×1211112231² = 2933585672155594722, 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 1211112231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211112233) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26256 + ... + 55781.

It is an arithmetic number, because the mean of its divisors is an integer number (62348880).

Almost surely, 2^1211112231 is an apocalyptic number.

1211112231 is a deficient number, since it is larger than the sum of its proper divisors (784051929).

1211112231 is a wasteful number, since it uses less digits than its factorization.

1211112231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82103.

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

The square root of 1211112231 is about 34801.0377862500. The cubic root of 1211112231 is about 1065.9286370099.

Adding to 1211112231 its reverse (1322111121), we get a palindrome (2533223352).

It can be divided in two parts, 12111 and 12231, that added together give a palindrome (24342).

The spelling of 1211112231 in words is "one billion, two hundred eleven million, one hundred twelve thousand, two hundred thirty-one".