12011221121 has 8 divisors (see below), whose sum is σ = 12328964640. Its totient is φ = 11697283168.

The previous prime is 12011221111. The next prime is 12011221129. The reversal of 12011221121 is 12112211021.

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 12011221121 - 2¹⁸ = 12010958977 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12011221096 and 12011221105.

It is not an unprimeable number, because it can be changed into a prime (12011221129) 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, 944996 + ... + 957621.

It is an arithmetic number, because the mean of its divisors is an integer number (1541120580).

Almost surely, 2^12011221121 is an apocalyptic number.

It is an amenable number.

12011221121 is a deficient number, since it is larger than the sum of its proper divisors (317743519).

12011221121 is a wasteful number, since it uses less digits than its factorization.

12011221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1902783.

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

Adding to 12011221121 its reverse (12112211021), we get a palindrome (24123432142).

The spelling of 12011221121 in words is "twelve billion, eleven million, two hundred twenty-one thousand, one hundred twenty-one".