212221102021221 has 64 divisors (see below), whose sum is σ = 294331519065600. Its totient is φ = 135905299246080.

The previous prime is 212221102021207. The next prime is 212221102021223. The reversal of 212221102021221 is 122120201122212.

It is not a de Polignac number, because 212221102021221 - 2¹³ = 212221102013029 is a prime.

It is a super-2 number, since 2×212221102021221² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212221102021223) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 13542274216 + ... + 13542289886.

It is an arithmetic number, because the mean of its divisors is an integer number (4598929985400).

Almost surely, 2^{212221102021221} is an apocalyptic number.

It is an amenable number.

212221102021221 is a deficient number, since it is larger than the sum of its proper divisors (82110417044379).

212221102021221 is a wasteful number, since it uses less digits than its factorization.

212221102021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20766.

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

Adding to 212221102021221 its reverse (122120201122212), we get a palindrome (334341303143433).

The spelling of 212221102021221 in words is "two hundred twelve trillion, two hundred twenty-one billion, one hundred two million, twenty-one thousand, two hundred twenty-one".