12221022001221 has 24 divisors (see below), whose sum is σ = 19264015802304. Its totient is φ = 7404123154560.

The previous prime is 12221022001213. The next prime is 12221022001259. The reversal of 12221022001221 is 12210022012221.

It is a happy number.

12221022001221 is a `hidden beast` number, since 1 + 2 + 221 + 0 + 220 + 0 + 1 + 221 = 666.

It is not a de Polignac number, because 12221022001221 - 2³ = 12221022001213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12221022001194 and 12221022001203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221022001121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21018801 + ... + 21592406.

It is an arithmetic number, because the mean of its divisors is an integer number (802667325096).

Almost surely, 2^{12221022001221} is an apocalyptic number.

12221022001221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12221022001221 is a deficient number, since it is larger than the sum of its proper divisors (7042993801083).

12221022001221 is a wasteful number, since it uses less digits than its factorization.

12221022001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42614121 (or 42614118 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 12221022001221 its reverse (12210022012221), we get a palindrome (24431044013442).

The spelling of 12221022001221 in words is "twelve trillion, two hundred twenty-one billion, twenty-two million, one thousand, two hundred twenty-one".