111211232005 has 4 divisors (see below), whose sum is σ = 133453478412. Its totient is φ = 88968985600.

The previous prime is 111211231991. The next prime is 111211232023. The reversal of 111211232005 is 500232112111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25513353441 + 85697878564 = 159729^2 + 292742^2 .

It is not a de Polignac number, because 111211232005 - 2¹¹ = 111211229957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11121123196 + ... + 11121123205.

It is an arithmetic number, because the mean of its divisors is an integer number (33363369603).

Almost surely, 2^111211232005 is an apocalyptic number.

It is an amenable number.

111211232005 is a deficient number, since it is larger than the sum of its proper divisors (22242246407).

111211232005 is an equidigital number, since it uses as much as digits as its factorization.

111211232005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22242246406.

The product of its (nonzero) digits is 120, while the sum is 19.

Adding to 111211232005 its reverse (500232112111), we get a palindrome (611443344116).

The spelling of 111211232005 in words is "one hundred eleven billion, two hundred eleven million, two hundred thirty-two thousand, five".