12231211012221 has 4 divisors (see below), whose sum is σ = 16308281349632. Its totient is φ = 8154140674812.

The previous prime is 12231211012177. The next prime is 12231211012283. The reversal of 12231211012221 is 12221011213221.

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 12231211012221 - 2⁷ = 12231211012093 is a prime.

It is a super-2 number, since 2×12231211012221² (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 (12231211012421) 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, 2038535168701 + ... + 2038535168706.

It is an arithmetic number, because the mean of its divisors is an integer number (4077070337408).

Almost surely, 2^{12231211012221} is an apocalyptic number.

It is an amenable number.

12231211012221 is a deficient number, since it is larger than the sum of its proper divisors (4077070337411).

12231211012221 is an equidigital number, since it uses as much as digits as its factorization.

12231211012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4077070337410.

The product of its (nonzero) digits is 192, while the sum is 21.

Adding to 12231211012221 its reverse (12221011213221), we get a palindrome (24452222225442).

The spelling of 12231211012221 in words is "twelve trillion, two hundred thirty-one billion, two hundred eleven million, twelve thousand, two hundred twenty-one".