11112221201121 has 36 divisors (see below), whose sum is σ = 16523443581372. Its totient is φ = 7196163928704.

The previous prime is 11112221201117. The next prime is 11112221201149. The reversal of 11112221201121 is 12110212221111.

It is a happy number.

11112221201121 is a `hidden beast` number, since 11 + 112 + 221 + 201 + 121 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 116789645025 + 10995431556096 = 341745^2 + 3315936^2 .

It is not a de Polignac number, because 11112221201121 - 2² = 11112221201117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11112221201094 and 11112221201103.

It is not an unprimeable number, because it can be changed into a prime (11112221201161) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 6817135 + ... + 8288411.

It is an arithmetic number, because the mean of its divisors is an integer number (458984543927).

Almost surely, 2^{11112221201121} is an apocalyptic number.

It is an amenable number.

11112221201121 is a deficient number, since it is larger than the sum of its proper divisors (5411222380251).

11112221201121 is a wasteful number, since it uses less digits than its factorization.

11112221201121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1471970 (or 1471930 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 11112221201121 its reverse (12110212221111), we get a palindrome (23222433422232).

The spelling of 11112221201121 in words is "eleven trillion, one hundred twelve billion, two hundred twenty-one million, two hundred one thousand, one hundred twenty-one".