12221021022221 has 16 divisors (see below), whose sum is σ = 13583872958976. Its totient is φ = 10901627310000.

The previous prime is 12221021022157. The next prime is 12221021022247. The reversal of 12221021022221 is 12222012012221.

It is a cyclic number.

It is not a de Polignac number, because 12221021022221 - 2⁶ = 12221021022157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12221021022193 and 12221021022202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221021022251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36915575 + ... + 37245156.

It is an arithmetic number, because the mean of its divisors is an integer number (848992059936).

Almost surely, 2^{12221021022221} is an apocalyptic number.

12221021022221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12221021022221 is a deficient number, since it is larger than the sum of its proper divisors (1362851936755).

12221021022221 is a wasteful number, since it uses less digits than its factorization.

12221021022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74161024.

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

Adding to 12221021022221 its reverse (12222012012221), we get a palindrome (24443033034442).

The spelling of 12221021022221 in words is "twelve trillion, two hundred twenty-one billion, twenty-one million, twenty-two thousand, two hundred twenty-one".