12012002021 has 2 divisors, whose sum is σ = 12012002022.
Its totient is φ = 12012002020.
The previous prime is 12012001999. The next prime is 12012002063. The reversal of 12012002021 is 12020021021.
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., 6526377796 + 5485624225 = 80786^2 + 74065^2
It is a cyclic number.
It is not a de Polignac number, because 12012002021 - 26 = 12012001957 is a prime.
It is a junction number, because it is equal to n+sod(n) for n = 12012001993 and 12012002011.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (12012002621) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6006001010 + 6006001011.
It is an arithmetic number, because the mean of its divisors is an integer number (6006001011).
Almost surely, 212012002021 is an apocalyptic number.
It is an amenable number.
12012002021 is a deficient number, since it is larger than the sum of its proper divisors (1).
12012002021 is an equidigital number, since it uses as much as digits as its factorization.
12012002021 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 16, while the sum is 11.
Adding to 12012002021 its reverse (12020021021), we get a palindrome (24032023042).
The spelling of 12012002021 in words is "twelve billion, twelve million, two thousand, twenty-one".