22021212201221 has 8 divisors (see below), whose sum is σ = 22120184390304. Its totient is φ = 21922416907920.

The previous prime is 22021212201193. The next prime is 22021212201239. The reversal of 22021212201221 is 12210221212022.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22021212201221 is a prime.

It is a super-2 number, since 2×22021212201221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22021212201193 and 22021212201202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22021212201271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43974410 + ... + 44472363.

It is an arithmetic number, because the mean of its divisors is an integer number (2765023048788).

Almost surely, 2^{22021212201221} is an apocalyptic number.

It is an amenable number.

22021212201221 is a deficient number, since it is larger than the sum of its proper divisors (98972189083).

22021212201221 is an equidigital number, since it uses as much as digits as its factorization.

22021212201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88447891.

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

Adding to 22021212201221 its reverse (12210221212022), we get a palindrome (34231433413243).

The spelling of 22021212201221 in words is "twenty-two trillion, twenty-one billion, two hundred twelve million, two hundred one thousand, two hundred twenty-one".