12121312122111 has 4 divisors (see below), whose sum is σ = 16161749496152. Its totient is φ = 8080874748072.

The previous prime is 12121312122109. The next prime is 12121312122131. The reversal of 12121312122111 is 11122121312121.

12121312122111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 12121312122111 - 2¹ = 12121312122109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121312122131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2020218687016 + ... + 2020218687021.

It is an arithmetic number, because the mean of its divisors is an integer number (4040437374038).

Almost surely, 2^{12121312122111} is an apocalyptic number.

12121312122111 is a deficient number, since it is larger than the sum of its proper divisors (4040437374041).

12121312122111 is an equidigital number, since it uses as much as digits as its factorization.

12121312122111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4040437374040.

The product of its digits is 96, while the sum is 21.

Adding to 12121312122111 its reverse (11122121312121), we get a palindrome (23243433434232).

The spelling of 12121312122111 in words is "twelve trillion, one hundred twenty-one billion, three hundred twelve million, one hundred twenty-two thousand, one hundred eleven".