121011121211 has 4 divisors (see below), whose sum is σ = 121020457800. Its totient is φ = 121001784624.

The previous prime is 121011121193. The next prime is 121011121241. The reversal of 121011121211 is 112121110121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 112121110121 = 19 ⋅5901111059.

It is a cyclic number.

It is not a de Polignac number, because 121011121211 - 2¹⁰ = 121011120187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121011121241) 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, 4648826 + ... + 4674783.

It is an arithmetic number, because the mean of its divisors is an integer number (30255114450).

Almost surely, 2^121011121211 is an apocalyptic number.

121011121211 is a deficient number, since it is larger than the sum of its proper divisors (9336589).

121011121211 is an equidigital number, since it uses as much as digits as its factorization.

121011121211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9336588.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 121011121211 its reverse (112121110121), we get a palindrome (233132231332).

The spelling of 121011121211 in words is "one hundred twenty-one billion, eleven million, one hundred twenty-one thousand, two hundred eleven".