11101212212121 has 12 divisors (see below), whose sum is σ = 16732261885248. Its totient is φ = 7079033874264.

The previous prime is 11101212212089. The next prime is 11101212212137. The reversal of 11101212212121 is 12121221210111.

It is a happy number.

11101212212121 is a `hidden beast` number, since 1 + 110 + 121 + 221 + 212 + 1 = 666.

It is not a de Polignac number, because 11101212212121 - 2⁵ = 11101212212089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11101212212094 and 11101212212103.

It is not an unprimeable number, because it can be changed into a prime (11101212212141) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26814522045 + ... + 26814522458.

It is an arithmetic number, because the mean of its divisors is an integer number (1394355157104).

Almost surely, 2^{11101212212121} is an apocalyptic number.

It is an amenable number.

11101212212121 is a deficient number, since it is larger than the sum of its proper divisors (5631049673127).

11101212212121 is a wasteful number, since it uses less digits than its factorization.

11101212212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53629044532 (or 53629044529 counting only the distinct ones).

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

Adding to 11101212212121 its reverse (12121221210111), we get a palindrome (23222433422232).

The spelling of 11101212212121 in words is "eleven trillion, one hundred one billion, two hundred twelve million, two hundred twelve thousand, one hundred twenty-one".