111211021321231 has 12 divisors (see below), whose sum is σ = 120424762661880. Its totient is φ = 102655480019040.

The previous prime is 111211021321163. The next prime is 111211021321237. The reversal of 111211021321231 is 132123120112111.

It is not a de Polignac number, because 111211021321231 - 2¹³ = 111211021313039 is a prime.

It is a super-2 number, since 2×111211021321231² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111211021321237) 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 in 11 ways as a sum of consecutive naturals, for example, 18298561 + ... + 23606341.

It is an arithmetic number, because the mean of its divisors is an integer number (10035396888490).

Almost surely, 2^{111211021321231} is an apocalyptic number.

111211021321231 is a deficient number, since it is larger than the sum of its proper divisors (9213741340649).

111211021321231 is a wasteful number, since it uses less digits than its factorization.

111211021321231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5431786 (or 5431773 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 22.

Adding to 111211021321231 its reverse (132123120112111), we get a palindrome (243334141433342).

The spelling of 111211021321231 in words is "one hundred eleven trillion, two hundred eleven billion, twenty-one million, three hundred twenty-one thousand, two hundred thirty-one".