1231101211111 has 8 divisors (see below), whose sum is σ = 1244315153984. Its totient is φ = 1217897925120.

The previous prime is 1231101211073. The next prime is 1231101211127. The reversal of 1231101211111 is 1111121011321.

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

It is a cyclic number.

It is not a de Polignac number, because 1231101211111 - 2³⁹ = 681345397223 is a prime.

It is a super-2 number, since 2×1231101211111² (a number of 25 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 (1231101211141) 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 7 ways as a sum of consecutive naturals, for example, 2431830 + ... + 2894131.

It is an arithmetic number, because the mean of its divisors is an integer number (155539394248).

Almost surely, 2^{1231101211111} is an apocalyptic number.

1231101211111 is a deficient number, since it is larger than the sum of its proper divisors (13213942873).

1231101211111 is an equidigital number, since it uses as much as digits as its factorization.

1231101211111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5328441.

The product of its (nonzero) digits is 12, while the sum is 16.

Adding to 1231101211111 its reverse (1111121011321), we get a palindrome (2342222222432).

The spelling of 1231101211111 in words is "one trillion, two hundred thirty-one billion, one hundred one million, two hundred eleven thousand, one hundred eleven".