12011012121 has 4 divisors (see below), whose sum is σ = 16014682832. Its totient is φ = 8007341412.

The previous prime is 12011012071. The next prime is 12011012129. The reversal of 12011012121 is 12121011021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 12011012121 - 2⁹ = 12011011609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12011012097 and 12011012106.

It is not an unprimeable number, because it can be changed into a prime (12011012129) 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, 2001835351 + ... + 2001835356.

It is an arithmetic number, because the mean of its divisors is an integer number (4003670708).

Almost surely, 2^12011012121 is an apocalyptic number.

It is an amenable number.

12011012121 is a deficient number, since it is larger than the sum of its proper divisors (4003670711).

12011012121 is an equidigital number, since it uses as much as digits as its factorization.

12011012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4003670710.

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

Adding to 12011012121 its reverse (12121011021), we get a palindrome (24132023142).

It can be divided in two parts, 120110 and 12121, that added together give a palindrome (132231).

The spelling of 12011012121 in words is "twelve billion, eleven million, twelve thousand, one hundred twenty-one".