12011211210221 has 12 divisors (see below), whose sum is σ = 12438233778516. Its totient is φ = 11597447930880.

The previous prime is 12011211210217. The next prime is 12011211210233. The reversal of 12011211210221 is 12201211211021.

It can be written as a sum of positive squares in 6 ways, for example, as 8071343502121 + 3939867708100 = 2841011^2 + 1984910^2 .

It is not a de Polignac number, because 12011211210221 - 2² = 12011211210217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12011211210221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12011211210821) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36668270 + ... + 36994383.

It is an arithmetic number, because the mean of its divisors is an integer number (1036519481543).

Almost surely, 2^{12011211210221} is an apocalyptic number.

It is an amenable number.

12011211210221 is a deficient number, since it is larger than the sum of its proper divisors (427022568295).

12011211210221 is an frugal number, since it uses more digits than its factorization.

12011211210221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73662832 (or 73662791 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 12011211210221 its reverse (12201211211021), we get a palindrome (24212422421242).

The spelling of 12011211210221 in words is "twelve trillion, eleven billion, two hundred eleven million, two hundred ten thousand, two hundred twenty-one".