111211311211001 has 4 divisors (see below), whose sum is σ = 111394525892352. Its totient is φ = 111028096529652.

The previous prime is 111211311210983. The next prime is 111211311211009. The reversal of 111211311211001 is 100112113112111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 111211311211001 - 2¹⁴ = 111211311194617 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (111211311211009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91607339765 + ... + 91607340978.

It is an arithmetic number, because the mean of its divisors is an integer number (27848631473088).

Almost surely, 2^{111211311211001} is an apocalyptic number.

It is an amenable number.

111211311211001 is a deficient number, since it is larger than the sum of its proper divisors (183214681351).

111211311211001 is an equidigital number, since it uses as much as digits as its factorization.

111211311211001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183214681350.

The product of its (nonzero) digits is 12, while the sum is 17.

Adding to 111211311211001 its reverse (100112113112111), we get a palindrome (211323424323112).

The spelling of 111211311211001 in words is "one hundred eleven trillion, two hundred eleven billion, three hundred eleven million, two hundred eleven thousand, one".