212221210201221 has 32 divisors (see below), whose sum is σ = 309264263239680. Its totient is φ = 128664103417344.

The previous prime is 212221210201213. The next prime is 212221210201277. The reversal of 212221210201221 is 122102012122212.

It is not a de Polignac number, because 212221210201221 - 2³ = 212221210201213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212221210201621) 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 31 ways as a sum of consecutive naturals, for example, 109401765 + ... + 111324698.

It is an arithmetic number, because the mean of its divisors is an integer number (9664508226240).

Almost surely, 2^{212221210201221} is an apocalyptic number.

It is an amenable number.

212221210201221 is a deficient number, since it is larger than the sum of its proper divisors (97043053038459).

212221210201221 is a wasteful number, since it uses less digits than its factorization.

212221210201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220726845.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 212221210201221 its reverse (122102012122212), we get a palindrome (334323222323433).

The spelling of 212221210201221 in words is "two hundred twelve trillion, two hundred twenty-one billion, two hundred ten million, two hundred one thousand, two hundred twenty-one".