12011032211221 has 4 divisors (see below), whose sum is σ = 12041908901100. Its totient is φ = 11980155521344.

The previous prime is 12011032211219. The next prime is 12011032211251. The reversal of 12011032211221 is 12211223011021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3238239839121 + 8772792372100 = 1799511^2 + 2961890^2 .

It is a cyclic number.

It is not a de Polignac number, because 12011032211221 - 2¹ = 12011032211219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12011032211251) 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, 15438344356 + ... + 15438345133.

It is an arithmetic number, because the mean of its divisors is an integer number (3010477225275).

Almost surely, 2^{12011032211221} is an apocalyptic number.

It is an amenable number.

12011032211221 is a deficient number, since it is larger than the sum of its proper divisors (30876689879).

12011032211221 is an equidigital number, since it uses as much as digits as its factorization.

12011032211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30876689878.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 12011032211221 its reverse (12211223011021), we get a palindrome (24222255222242).

The spelling of 12011032211221 in words is "twelve trillion, eleven billion, thirty-two million, two hundred eleven thousand, two hundred twenty-one".