12012121011 has 16 divisors (see below), whose sum is σ = 17475118848. Its totient is φ = 7278847200.

The previous prime is 12012121007. The next prime is 12012121039. The reversal of 12012121011 is 11012121021.

It is not a de Polignac number, because 12012121011 - 2² = 12012121007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12012121061) 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, 192490 + ... + 247136.

It is an arithmetic number, because the mean of its divisors is an integer number (1092194928).

Almost surely, 2^12012121011 is an apocalyptic number.

12012121011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12012121011 is a deficient number, since it is larger than the sum of its proper divisors (5462997837).

12012121011 is a wasteful number, since it uses less digits than its factorization.

12012121011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61322.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 12012121011 its reverse (11012121021), we get a palindrome (23024242032).

It can be divided in two parts, 1201 and 2121011, that added together give a palindrome (2122212).

The spelling of 12012121011 in words is "twelve billion, twelve million, one hundred twenty-one thousand, eleven".