12213221002121 has 4 divisors (see below), whose sum is σ = 12213306385044. Its totient is φ = 12213135619200.

The previous prime is 12213221002063. The next prime is 12213221002159. The reversal of 12213221002121 is 12120012231221.

12213221002121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2962735987600 + 9250485014521 = 1721260^2 + 3041461^2 .

It is a cyclic number.

It is not a de Polignac number, because 12213221002121 - 2⁶ = 12213221002057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12213221002093 and 12213221002102.

It is not an unprimeable number, because it can be changed into a prime (12213221002721) 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, 42476540 + ... + 42763101.

It is an arithmetic number, because the mean of its divisors is an integer number (3053326596261).

Almost surely, 2^{12213221002121} is an apocalyptic number.

It is an amenable number.

12213221002121 is a deficient number, since it is larger than the sum of its proper divisors (85382923).

12213221002121 is an equidigital number, since it uses as much as digits as its factorization.

12213221002121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85382922.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 12213221002121 its reverse (12120012231221), we get a palindrome (24333233233342).

The spelling of 12213221002121 in words is "twelve trillion, two hundred thirteen billion, two hundred twenty-one million, two thousand, one hundred twenty-one".