12121021101111 has 16 divisors (see below), whose sum is σ = 17965979996160. Its totient is φ = 7218474104160.

The previous prime is 12121021101083. The next prime is 12121021101169. The reversal of 12121021101111 is 11110112012121.

It is not a de Polignac number, because 12121021101111 - 2⁷ = 12121021100983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121021101181) 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, 5012828031 + ... + 5012830448.

It is an arithmetic number, because the mean of its divisors is an integer number (1122873749760).

Almost surely, 2^{12121021101111} is an apocalyptic number.

12121021101111 is a deficient number, since it is larger than the sum of its proper divisors (5844958895049).

12121021101111 is a wasteful number, since it uses less digits than its factorization.

12121021101111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10025658526.

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

Adding to 12121021101111 its reverse (11110112012121), we get a palindrome (23231133113232).

The spelling of 12121021101111 in words is "twelve trillion, one hundred twenty-one billion, twenty-one million, one hundred one thousand, one hundred eleven".