11121201111 has 16 divisors (see below), whose sum is σ = 15297357824. Its totient is φ = 7181387424.

The previous prime is 11121201071. The next prime is 11121201127. The reversal of 11121201111 is 11110212111.

It is not a de Polignac number, because 11121201111 - 2¹⁴ = 11121184727 is a prime.

It is a super-2 number, since 2×11121201111² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11121201131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 199891 + ... + 249396.

It is an arithmetic number, because the mean of its divisors is an integer number (956084864).

Almost surely, 2^11121201111 is an apocalyptic number.

11121201111 is a deficient number, since it is larger than the sum of its proper divisors (4176156713).

11121201111 is a wasteful number, since it uses less digits than its factorization.

11121201111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449550.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 11121201111 its reverse (11110212111), we get a palindrome (22231413222).

The spelling of 11121201111 in words is "eleven billion, one hundred twenty-one million, two hundred one thousand, one hundred eleven".