12121212011 has 4 divisors (see below), whose sum is σ = 12145310352. Its totient is φ = 12097113672.

The previous prime is 12121211953. The next prime is 12121212067. The reversal of 12121212011 is 11021212121.

12121212011 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, and also an emirpimes, since its reverse is a distinct semiprime: 11021212121 = 17903 ⋅615607.

It is a cyclic number.

It is not a de Polignac number, because 12121212011 - 2²² = 12117017707 is a prime.

It is a super-2 number, since 2×12121212011² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12121214011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12048416 + ... + 12049421.

It is an arithmetic number, because the mean of its divisors is an integer number (3036327588).

Almost surely, 2^12121212011 is an apocalyptic number.

12121212011 is a deficient number, since it is larger than the sum of its proper divisors (24098341).

12121212011 is an equidigital number, since it uses as much as digits as its factorization.

12121212011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24098340.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 12121212011 its reverse (11021212121), we get a palindrome (23142424132).

The spelling of 12121212011 in words is "twelve billion, one hundred twenty-one million, two hundred twelve thousand, eleven".