12100221011221 has 4 divisors (see below), whose sum is σ = 13828824012832. Its totient is φ = 10371618009612.

The previous prime is 12100221011161. The next prime is 12100221011239. The reversal of 12100221011221 is 12211012200121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12100221011221 - 2¹³ = 12100221003029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12100221011195 and 12100221011204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12100221011251) 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, 864301500795 + ... + 864301500808.

It is an arithmetic number, because the mean of its divisors is an integer number (3457206003208).

Almost surely, 2^{12100221011221} is an apocalyptic number.

It is an amenable number.

12100221011221 is a deficient number, since it is larger than the sum of its proper divisors (1728603001611).

12100221011221 is an equidigital number, since it uses as much as digits as its factorization.

12100221011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1728603001610.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 12100221011221 its reverse (12211012200121), we get a palindrome (24311233211342).

The spelling of 12100221011221 in words is "twelve trillion, one hundred billion, two hundred twenty-one million, eleven thousand, two hundred twenty-one".