12311012111221 has 4 divisors (see below), whose sum is σ = 13035189294252. Its totient is φ = 11586834928192.

The previous prime is 12311012111213. The next prime is 12311012111227. The reversal of 12311012111221 is 12211121011321.

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 4850957795121 + 7460054316100 = 2202489^2 + 2731310^2 .

It is a cyclic number.

It is not a de Polignac number, because 12311012111221 - 2³ = 12311012111213 is a prime.

It is a super-2 number, since 2×12311012111221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12311012111227) 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, 362088591490 + ... + 362088591523.

It is an arithmetic number, because the mean of its divisors is an integer number (3258797323563).

Almost surely, 2^{12311012111221} is an apocalyptic number.

It is an amenable number.

12311012111221 is a deficient number, since it is larger than the sum of its proper divisors (724177183031).

12311012111221 is an equidigital number, since it uses as much as digits as its factorization.

12311012111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 724177183030.

The product of its (nonzero) digits is 48, while the sum is 19.

Adding to 12311012111221 its reverse (12211121011321), we get a palindrome (24522133122542).

The spelling of 12311012111221 in words is "twelve trillion, three hundred eleven billion, twelve million, one hundred eleven thousand, two hundred twenty-one".