111233121231 has 16 divisors (see below), whose sum is σ = 153198194688. Its totient is φ = 71714954400.

The previous prime is 111233121227. The next prime is 111233121253. The reversal of 111233121231 is 132121332111.

It is not a de Polignac number, because 111233121231 - 2² = 111233121227 is a prime.

It is a super-2 number, since 2×111233121231² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 111233121198 and 111233121207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111233121331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 263880 + ... + 540461.

It is an arithmetic number, because the mean of its divisors is an integer number (9574887168).

Almost surely, 2^111233121231 is an apocalyptic number.

111233121231 is a deficient number, since it is larger than the sum of its proper divisors (41965073457).

111233121231 is a wasteful number, since it uses less digits than its factorization.

111233121231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 805862.

The product of its digits is 216, while the sum is 21.

Adding to 111233121231 its reverse (132121332111), we get a palindrome (243354453342).

The spelling of 111233121231 in words is "one hundred eleven billion, two hundred thirty-three million, one hundred twenty-one thousand, two hundred thirty-one".