12200221211221 has 4 divisors (see below), whose sum is σ = 12212170498444. Its totient is φ = 12188271924000.

The previous prime is 12200221211219. The next prime is 12200221211291. The reversal of 12200221211221 is 12211212200221.

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 10421694910225 + 1778526300996 = 3228265^2 + 1333614^2 .

It is a cyclic number.

It is not a de Polignac number, because 12200221211221 - 2¹ = 12200221211219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12200221211291) 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, 5974642080 + ... + 5974644121.

It is an arithmetic number, because the mean of its divisors is an integer number (3053042624611).

Almost surely, 2^{12200221211221} is an apocalyptic number.

It is an amenable number.

12200221211221 is a deficient number, since it is larger than the sum of its proper divisors (11949287223).

12200221211221 is a wasteful number, since it uses less digits than its factorization.

12200221211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11949287222.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 12200221211221 its reverse (12211212200221), we get a palindrome (24411433411442).

The spelling of 12200221211221 in words is "twelve trillion, two hundred billion, two hundred twenty-one million, two hundred eleven thousand, two hundred twenty-one".