11211111121 has 8 divisors (see below), whose sum is σ = 12974885120. Its totient is φ = 9487883808.

The previous prime is 11211111097. The next prime is 11211111151. The reversal of 11211111121 is 12111111211.

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 11211111121 - 2⁷ = 11211110993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11211111151) 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, 10136076 + ... + 10137181.

It is an arithmetic number, because the mean of its divisors is an integer number (1621860640).

Almost surely, 2^11211111121 is an apocalyptic number.

It is an amenable number.

11211111121 is a deficient number, since it is larger than the sum of its proper divisors (1763773999).

11211111121 is an equidigital number, since it uses as much as digits as its factorization.

11211111121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20273343.

The product of its digits is 4, while the sum is 13.

Adding to 11211111121 its reverse (12111111211), we get a palindrome (23322222332).

The spelling of 11211111121 in words is "eleven billion, two hundred eleven million, one hundred eleven thousand, one hundred twenty-one".