12101112210221 has 12 divisors (see below), whose sum is σ = 12855387542868. Its totient is φ = 11388774546432.

The previous prime is 12101112210193. The next prime is 12101112210227. The reversal of 12101112210221 is 12201221110121.

It can be written as a sum of positive squares in 6 ways, for example, as 26564436196 + 12074547774025 = 162986^2 + 3474845^2 .

It is not a de Polignac number, because 12101112210221 - 2¹⁴ = 12101112193837 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12101112210221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12101112210227) 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, 5643605 + ... + 7486821.

It is an arithmetic number, because the mean of its divisors is an integer number (1071282295239).

Almost surely, 2^{12101112210221} is an apocalyptic number.

It is an amenable number.

12101112210221 is a deficient number, since it is larger than the sum of its proper divisors (754275332647).

12101112210221 is a wasteful number, since it uses less digits than its factorization.

12101112210221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1865968 (or 1865951 counting only the distinct ones).

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

Adding to 12101112210221 its reverse (12201221110121), we get a palindrome (24302333320342).

The spelling of 12101112210221 in words is "twelve trillion, one hundred one billion, one hundred twelve million, two hundred ten thousand, two hundred twenty-one".