11212111012121 has 4 divisors (see below), whose sum is σ = 11573792012544. Its totient is φ = 10850430011700.

The previous prime is 11212111012073. The next prime is 11212111012163. The reversal of 11212111012121 is 12121011121211.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11212111012121 - 2¹⁸ = 11212110749977 is a prime.

It is a super-2 number, since 2×11212111012121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11212111012121.

It is not an unprimeable number, because it can be changed into a prime (11212111012621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 180840500165 + ... + 180840500226.

It is an arithmetic number, because the mean of its divisors is an integer number (2893448003136).

Almost surely, 2^{11212111012121} is an apocalyptic number.

It is an amenable number.

11212111012121 is a deficient number, since it is larger than the sum of its proper divisors (361681000423).

11212111012121 is an equidigital number, since it uses as much as digits as its factorization.

11212111012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361681000422.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 11212111012121 its reverse (12121011121211), we get a palindrome (23333122133332).

The spelling of 11212111012121 in words is "eleven trillion, two hundred twelve billion, one hundred eleven million, twelve thousand, one hundred twenty-one".