12121012111011 has 4 divisors (see below), whose sum is σ = 16161349481352. Its totient is φ = 8080674740672.

The previous prime is 12121012111009. The next prime is 12121012111031. The reversal of 12121012111011 is 11011121012121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12121012111011 - 2¹ = 12121012111009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12121012111031) 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, 2020168685166 + ... + 2020168685171.

It is an arithmetic number, because the mean of its divisors is an integer number (4040337370338).

Almost surely, 2^{12121012111011} is an apocalyptic number.

12121012111011 is a deficient number, since it is larger than the sum of its proper divisors (4040337370341).

12121012111011 is an equidigital number, since it uses as much as digits as its factorization.

12121012111011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4040337370340.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 12121012111011 its reverse (11011121012121), we get a palindrome (23132133123132).

The spelling of 12121012111011 in words is "twelve trillion, one hundred twenty-one billion, twelve million, one hundred eleven thousand, eleven".