12013211209 has 2 divisors, whose sum is σ = 12013211210. Its totient is φ = 12013211208.

The previous prime is 12013211183. The next prime is 12013211237. The reversal of 12013211209 is 90211231021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7814560000 + 4198651209 = 88400^2 + 64797^2 .

It is a cyclic number.

It is not a de Polignac number, because 12013211209 - 2⁹ = 12013210697 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12013211209.

It is not a weakly prime, because it can be changed into another prime (12013211809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6006605604 + 6006605605.

It is an arithmetic number, because the mean of its divisors is an integer number (6006605605).

Almost surely, 2^12013211209 is an apocalyptic number.

It is an amenable number.

12013211209 is a deficient number, since it is larger than the sum of its proper divisors (1).

12013211209 is an equidigital number, since it uses as much as digits as its factorization.

12013211209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 22.

The spelling of 12013211209 in words is "twelve billion, thirteen million, two hundred eleven thousand, two hundred nine".