12012211009 has 2 divisors, whose sum is σ = 12012211010. Its totient is φ = 12012211008.

The previous prime is 12012210971. The next prime is 12012211021. The reversal of 12012211009 is 90011221021.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11029200400 + 983010609 = 105020^2 + 31353^2 .

It is a cyclic number.

It is not a de Polignac number, because 12012211009 - 2¹³ = 12012202817 is a prime.

It is not a weakly prime, because it can be changed into another prime (12012211069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6006105504 + 6006105505.

It is an arithmetic number, because the mean of its divisors is an integer number (6006105505).

Almost surely, 2^12012211009 is an apocalyptic number.

It is an amenable number.

12012211009 is a deficient number, since it is larger than the sum of its proper divisors (1).

12012211009 is an equidigital number, since it uses as much as digits as its factorization.

12012211009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 19.

It can be divided in two parts, 120122 and 11009, that added together give a palindrome (131131).

The spelling of 12012211009 in words is "twelve billion, twelve million, two hundred eleven thousand, nine".