11111001121001 has 8 divisors (see below), whose sum is σ = 11369441260320. Its totient is φ = 10852563016512.

The previous prime is 11111001120997. The next prime is 11111001121027. The reversal of 11111001121001 is 10012110011111.

It is a happy number.

11111001121001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 11111001121001 - 2² = 11111001120997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11111001121061) 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, 20786870 + ... + 21314688.

It is an arithmetic number, because the mean of its divisors is an integer number (1421180157540).

Almost surely, 2^{11111001121001} is an apocalyptic number.

It is an amenable number.

11111001121001 is a deficient number, since it is larger than the sum of its proper divisors (258440139319).

11111001121001 is an equidigital number, since it uses as much as digits as its factorization.

11111001121001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1017415.

The product of its (nonzero) digits is 2, while the sum is 11.

Adding to 11111001121001 its reverse (10012110011111), we get a palindrome (21123111132112).

The spelling of 11111001121001 in words is "eleven trillion, one hundred eleven billion, one million, one hundred twenty-one thousand, one".