12011123221 has 4 divisors (see below), whose sum is σ = 12290451712. Its totient is φ = 11731794732.

The previous prime is 12011123209. The next prime is 12011123263. The reversal of 12011123221 is 12232111021.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12232111021 = 13 ⋅940931617.

It is a cyclic number.

It is not a de Polignac number, because 12011123221 - 2⁷ = 12011123093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12011123195 and 12011123204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12011123281) 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, 139664181 + ... + 139664266.

It is an arithmetic number, because the mean of its divisors is an integer number (3072612928).

Almost surely, 2^12011123221 is an apocalyptic number.

It is an amenable number.

12011123221 is a deficient number, since it is larger than the sum of its proper divisors (279328491).

12011123221 is an equidigital number, since it uses as much as digits as its factorization.

12011123221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279328490.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 12011123221 its reverse (12232111021), we get a palindrome (24243234242).

The spelling of 12011123221 in words is "twelve billion, eleven million, one hundred twenty-three thousand, two hundred twenty-one".