11211111001 has 4 divisors (see below), whose sum is σ = 11212617892. Its totient is φ = 11209604112.

The previous prime is 11211110993. The next prime is 11211111017. The reversal of 11211111001 is 10011111211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10011111211 = 5807 ⋅1723973.

It can be written as a sum of positive squares in 2 ways, for example, as 6613592976 + 4597518025 = 81324^2 + 67805^2 .

It is a cyclic number.

It is not a de Polignac number, because 11211111001 - 2³ = 11211110993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11211111071) 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, 742230 + ... + 757183.

It is an arithmetic number, because the mean of its divisors is an integer number (2803154473).

Almost surely, 2^11211111001 is an apocalyptic number.

It is an amenable number.

11211111001 is a deficient number, since it is larger than the sum of its proper divisors (1506891).

11211111001 is an equidigital number, since it uses as much as digits as its factorization.

11211111001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1506890.

The product of its (nonzero) digits is 2, while the sum is 10.

Adding to 11211111001 its reverse (10011111211), we get a palindrome (21222222212).

The spelling of 11211111001 in words is "eleven billion, two hundred eleven million, one hundred eleven thousand, one".