12121112011 has 8 divisors (see below), whose sum is σ = 12139319664. Its totient is φ = 12102920160.

The previous prime is 12121111927. The next prime is 12121112027. The reversal of 12121112011 is 11021112121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12121112011 - 2¹⁷ = 12120980939 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12121111982 and 12121112000.

It is not an unprimeable number, because it can be changed into a prime (12121112711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2769621 + ... + 2773993.

It is an arithmetic number, because the mean of its divisors is an integer number (1517414958).

Almost surely, 2^12121112011 is an apocalyptic number.

12121112011 is a deficient number, since it is larger than the sum of its proper divisors (18207653).

12121112011 is a wasteful number, since it uses less digits than its factorization.

12121112011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7901.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 12121112011 its reverse (11021112121), we get a palindrome (23142224132).

The spelling of 12121112011 in words is "twelve billion, one hundred twenty-one million, one hundred twelve thousand, eleven".