12101221205 has 4 divisors (see below), whose sum is σ = 14521465452. Its totient is φ = 9680976960.

The previous prime is 12101221199. The next prime is 12101221211. The reversal of 12101221205 is 50212210121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50212210121 = 83 ⋅604966387.

It is an interprime number because it is at equal distance from previous prime (12101221199) and next prime (12101221211).

It can be written as a sum of positive squares in 2 ways, for example, as 7369707409 + 4731513796 = 85847^2 + 68786^2 .

It is a de Polignac number, because none of the positive numbers 2^k-12101221205 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1210122116 + ... + 1210122125.

It is an arithmetic number, because the mean of its divisors is an integer number (3630366363).

Almost surely, 2^12101221205 is an apocalyptic number.

It is an amenable number.

12101221205 is a deficient number, since it is larger than the sum of its proper divisors (2420244247).

12101221205 is an equidigital number, since it uses as much as digits as its factorization.

12101221205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2420244246.

The product of its (nonzero) digits is 80, while the sum is 17.

Adding to 12101221205 its reverse (50212210121), we get a palindrome (62313431326).

The spelling of 12101221205 in words is "twelve billion, one hundred one million, two hundred twenty-one thousand, two hundred five".