12100212012221 has 4 divisors (see below), whose sum is σ = 12100286569500. Its totient is φ = 12100137454944.

The previous prime is 12100212012191. The next prime is 12100212012227. The reversal of 12100212012221 is 12221021200121.

12100212012221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5046699348196 + 7053512664025 = 2246486^2 + 2655845^2 .

It is a cyclic number.

It is not a de Polignac number, because 12100212012221 - 2²² = 12100207817917 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 12100212012221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12100212012227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37034666 + ... + 37359963.

It is an arithmetic number, because the mean of its divisors is an integer number (3025071642375).

Almost surely, 2^{12100212012221} is an apocalyptic number.

It is an amenable number.

12100212012221 is a deficient number, since it is larger than the sum of its proper divisors (74557279).

12100212012221 is an equidigital number, since it uses as much as digits as its factorization.

12100212012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74557278.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 12100212012221 its reverse (12221021200121), we get a palindrome (24321233212342).

The spelling of 12100212012221 in words is "twelve trillion, one hundred billion, two hundred twelve million, twelve thousand, two hundred twenty-one".