11121112221 has 8 divisors (see below), whose sum is σ = 14872151424. Its totient is φ = 7392073920.

The previous prime is 11121112157. The next prime is 11121112253. The reversal of 11121112221 is 12221112111.

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 11121112221 - 2⁶ = 11121112157 is a prime.

11121112221 is a modest number, since divided by 112221 gives 11121 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 11121112221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11121112291) 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, 5499045 + ... + 5501066.

It is an arithmetic number, because the mean of its divisors is an integer number (1859018928).

Almost surely, 2^11121112221 is an apocalyptic number.

It is an amenable number.

11121112221 is a deficient number, since it is larger than the sum of its proper divisors (3751039203).

11121112221 is a wasteful number, since it uses less digits than its factorization.

11121112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11000451.

The product of its digits is 16, while the sum is 15.

Adding to 11121112221 its reverse (12221112111), we get a palindrome (23342224332).

The spelling of 11121112221 in words is "eleven billion, one hundred twenty-one million, one hundred twelve thousand, two hundred twenty-one".