12210220210121 has 4 divisors (see below), whose sum is σ = 12210235103172. Its totient is φ = 12210205317072.

The previous prime is 12210220210117. The next prime is 12210220210151. The reversal of 12210220210121 is 12101202201221.

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 1041289630096 + 11168930580025 = 1020436^2 + 3341995^2 .

It is a cyclic number.

It is not a de Polignac number, because 12210220210121 - 2² = 12210220210117 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 12210220210121.

It is not an unprimeable number, because it can be changed into a prime (12210220210151) 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, 6140366 + ... + 7881911.

It is an arithmetic number, because the mean of its divisors is an integer number (3052558775793).

Almost surely, 2^{12210220210121} is an apocalyptic number.

It is an amenable number.

12210220210121 is a deficient number, since it is larger than the sum of its proper divisors (14893051).

12210220210121 is an equidigital number, since it uses as much as digits as its factorization.

12210220210121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14893050.

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

Adding to 12210220210121 its reverse (12101202201221), we get a palindrome (24311422411342).

The spelling of 12210220210121 in words is "twelve trillion, two hundred ten billion, two hundred twenty million, two hundred ten thousand, one hundred twenty-one".