11212121000121 has 16 divisors (see below), whose sum is σ = 15052664808000. Its totient is φ = 7423181183168.

The previous prime is 11212121000107. The next prime is 11212121000141. The reversal of 11212121000121 is 12100012121211.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 11212121000121 - 2¹⁵ = 11212120967353 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11212121000121.

It is not an unprimeable number, because it can be changed into a prime (11212121000141) 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, 10810 + ... + 4735436.

It is an arithmetic number, because the mean of its divisors is an integer number (940791550500).

Almost surely, 2^{11212121000121} is an apocalyptic number.

It is an amenable number.

11212121000121 is a deficient number, since it is larger than the sum of its proper divisors (3840543807879).

11212121000121 is a wasteful number, since it uses less digits than its factorization.

11212121000121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4730088.

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

Adding to 11212121000121 its reverse (12100012121211), we get a palindrome (23312133121332).

The spelling of 11212121000121 in words is "eleven trillion, two hundred twelve billion, one hundred twenty-one million, one hundred twenty-one", and thus it is an aban number.