12221121100221 has 32 divisors (see below), whose sum is σ = 19837557187200. Its totient is φ = 7374396176640.

The previous prime is 12221121100183. The next prime is 12221121100231. The reversal of 12221121100221 is 12200112112221.

12221121100221 is a `hidden beast` number, since 1 + 2 + 221 + 121 + 100 + 221 = 666.

It is not a de Polignac number, because 12221121100221 - 2⁹ = 12221121099709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12221121100194 and 12221121100203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221121100231) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 89775996 + ... + 89912021.

It is an arithmetic number, because the mean of its divisors is an integer number (619923662100).

Almost surely, 2^{12221121100221} is an apocalyptic number.

12221121100221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12221121100221 is a deficient number, since it is larger than the sum of its proper divisors (7616436086979).

12221121100221 is a wasteful number, since it uses less digits than its factorization.

12221121100221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179688266 (or 179688260 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 12221121100221 its reverse (12200112112221), we get a palindrome (24421233212442).

The spelling of 12221121100221 in words is "twelve trillion, two hundred twenty-one billion, one hundred twenty-one million, one hundred thousand, two hundred twenty-one".