12210001021121 has 8 divisors (see below), whose sum is σ = 12455987448744. Its totient is φ = 11964592706560.

The previous prime is 12210001021103. The next prime is 12210001021123. The reversal of 12210001021121 is 12112010001221.

It can be written as a sum of positive squares in 4 ways, for example, as 4237171116721 + 7972829904400 = 2058439^2 + 2823620^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12210001021121 - 2¹⁴ = 12210001004737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12210001021096 and 12210001021105.

It is not an unprimeable number, because it can be changed into a prime (12210001021123) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 144485600 + ... + 144570081.

It is an arithmetic number, because the mean of its divisors is an integer number (1556998431093).

Almost surely, 2^{12210001021121} is an apocalyptic number.

It is an amenable number.

12210001021121 is a deficient number, since it is larger than the sum of its proper divisors (245986427623).

12210001021121 is an equidigital number, since it uses as much as digits as its factorization.

12210001021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289056531.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 12210001021121 its reverse (12112010001221), we get a palindrome (24322011022342).

The spelling of 12210001021121 in words is "twelve trillion, two hundred ten billion, one million, twenty-one thousand, one hundred twenty-one".