12012100121221 has 4 divisors (see below), whose sum is σ = 12012134688844. Its totient is φ = 12012065553600.

The previous prime is 12012100121201. The next prime is 12012100121237. The reversal of 12012100121221 is 12212100121021.

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 7125237230596 + 4886862890625 = 2669314^2 + 2210625^2 .

It is a cyclic number.

It is not a de Polignac number, because 12012100121221 - 2¹³ = 12012100113029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12012100121195 and 12012100121204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12012100121201) 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, 16757220 + ... + 17459341.

It is an arithmetic number, because the mean of its divisors is an integer number (3003033672211).

Almost surely, 2^{12012100121221} is an apocalyptic number.

It is an amenable number.

12012100121221 is a deficient number, since it is larger than the sum of its proper divisors (34567623).

12012100121221 is an equidigital number, since it uses as much as digits as its factorization.

12012100121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34567622.

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

Adding to 12012100121221 its reverse (12212100121021), we get a palindrome (24224200242242).

The spelling of 12012100121221 in words is "twelve trillion, twelve billion, one hundred million, one hundred twenty-one thousand, two hundred twenty-one".