111312021211 has 4 divisors (see below), whose sum is σ = 115150366800. Its totient is φ = 107473675624.

The previous prime is 111312021209. The next prime is 111312021221. The reversal of 111312021211 is 112120213111.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 111312021211 - 2¹ = 111312021209 is a prime.

It is a super-2 number, since 2×111312021211² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111312021221) 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 3 ways as a sum of consecutive naturals, for example, 1919172751 + ... + 1919172808.

It is an arithmetic number, because the mean of its divisors is an integer number (28787591700).

Almost surely, 2^111312021211 is an apocalyptic number.

111312021211 is a deficient number, since it is larger than the sum of its proper divisors (3838345589).

111312021211 is an equidigital number, since it uses as much as digits as its factorization.

111312021211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3838345588.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 111312021211 its reverse (112120213111), we get a palindrome (223432234322).

The spelling of 111312021211 in words is "one hundred eleven billion, three hundred twelve million, twenty-one thousand, two hundred eleven".