1231111302211 has 8 divisors (see below), whose sum is σ = 1468157577984. Its totient is φ = 1009358334600.

The previous prime is 1231111302193. The next prime is 1231111302217. The reversal of 1231111302211 is 1122031111321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1231111302211 - 2¹¹ = 1231111300163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231111302217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3823326865 + ... + 3823327186.

It is an arithmetic number, because the mean of its divisors is an integer number (183519697248).

Almost surely, 2^{1231111302211} is an apocalyptic number.

1231111302211 is a deficient number, since it is larger than the sum of its proper divisors (237046275773).

1231111302211 is an equidigital number, since it uses as much as digits as its factorization.

1231111302211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7646654081.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 1231111302211 its reverse (1122031111321), we get a palindrome (2353142413532).

The spelling of 1231111302211 in words is "one trillion, two hundred thirty-one billion, one hundred eleven million, three hundred two thousand, two hundred eleven".