211111111001 has 8 divisors (see below), whose sum is σ = 241276762560. Its totient is φ = 180947189808.

The previous prime is 211111110923. The next prime is 211111111027. The reversal of 211111111001 is 100111111112.

It is a happy number.

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

It is not a de Polignac number, because 211111111001 - 2¹⁰ = 211111109977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211111111061) 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, 159671 + ... + 669116.

It is an arithmetic number, because the mean of its divisors is an integer number (30159595320).

Almost surely, 2^211111111001 is an apocalyptic number.

It is an amenable number.

211111111001 is a deficient number, since it is larger than the sum of its proper divisors (30165651559).

211111111001 is an equidigital number, since it uses as much as digits as its factorization.

211111111001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 865183.

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

Adding to 211111111001 its reverse (100111111112), we get a palindrome (311222222113).

The spelling of 211111111001 in words is "two hundred eleven billion, one hundred eleven million, one hundred eleven thousand, one".