12012223021 has 2 divisors, whose sum is σ = 12012223022. Its totient is φ = 12012223020.

The previous prime is 12012222983. The next prime is 12012223061. The reversal of 12012223021 is 12032221021.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9645400521 + 2366822500 = 98211^2 + 48650^2 .

It is an emirp because it is prime and its reverse (12032221021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12012223021 - 2¹³ = 12012214829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12012222986 and 12012223004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12012223061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6006111510 + 6006111511.

It is an arithmetic number, because the mean of its divisors is an integer number (6006111511).

Almost surely, 2^12012223021 is an apocalyptic number.

It is an amenable number.

12012223021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12012223021 is an equidigital number, since it uses as much as digits as its factorization.

12012223021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 12012223021 its reverse (12032221021), we get a palindrome (24044444042).

It can be divided in two parts, 1201 and 2223021, that added together give a palindrome (2224222).

The spelling of 12012223021 in words is "twelve billion, twelve million, two hundred twenty-three thousand, twenty-one".