12232111021 has 4 divisors (see below), whose sum is σ = 13173042652. Its totient is φ = 11291179392.

The previous prime is 12232110889. The next prime is 12232111027. The reversal of 12232111021 is 12011123221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12011123221 = 43 ⋅279328447.

It can be written as a sum of positive squares in 2 ways, for example, as 3830372100 + 8401738921 = 61890^2 + 91661^2 .

It is a cyclic number.

It is not a de Polignac number, because 12232111021 - 2⁹ = 12232110509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12232110986 and 12232111004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12232111027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 470465796 + ... + 470465821.

It is an arithmetic number, because the mean of its divisors is an integer number (3293260663).

Almost surely, 2^12232111021 is an apocalyptic number.

It is an amenable number.

12232111021 is a deficient number, since it is larger than the sum of its proper divisors (940931631).

12232111021 is an equidigital number, since it uses as much as digits as its factorization.

12232111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 940931630.

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

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

The spelling of 12232111021 in words is "twelve billion, two hundred thirty-two million, one hundred eleven thousand, twenty-one".