12212222200121 has 4 divisors (see below), whose sum is σ = 12633333310500. Its totient is φ = 11791111089744.

The previous prime is 12212222200097. The next prime is 12212222200151. The reversal of 12212222200121 is 12100222221221.

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 4279887926521 + 7932334273600 = 2068789^2 + 2816440^2 .

It is a cyclic number.

It is not a de Polignac number, because 12212222200121 - 2¹⁰ = 12212222199097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12212222200093 and 12212222200102.

It is not an unprimeable number, because it can be changed into a prime (12212222200151) 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, 210555555146 + ... + 210555555203.

It is an arithmetic number, because the mean of its divisors is an integer number (3158333327625).

Almost surely, 2^{12212222200121} is an apocalyptic number.

It is an amenable number.

12212222200121 is a deficient number, since it is larger than the sum of its proper divisors (421111110379).

12212222200121 is an equidigital number, since it uses as much as digits as its factorization.

12212222200121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421111110378.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 12212222200121 its reverse (12100222221221), we get a palindrome (24312444421342).

The spelling of 12212222200121 in words is "twelve trillion, two hundred twelve billion, two hundred twenty-two million, two hundred thousand, one hundred twenty-one".