212201222011221 has 16 divisors (see below), whose sum is σ = 287575337000448. Its totient is φ = 139147327992000.

The previous prime is 212201222011199. The next prime is 212201222011301. The reversal of 212201222011221 is 122110222102212.

It is not a de Polignac number, because 212201222011221 - 2⁹ = 212201222010709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212201222011321) 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, 21369571 + ... + 29682671.

It is an arithmetic number, because the mean of its divisors is an integer number (17973458562528).

Almost surely, 2^{212201222011221} is an apocalyptic number.

It is an amenable number.

212201222011221 is a deficient number, since it is larger than the sum of its proper divisors (75374114989227).

212201222011221 is a wasteful number, since it uses less digits than its factorization.

212201222011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8452652.

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

Adding to 212201222011221 its reverse (122110222102212), we get a palindrome (334311444113433).

Subtracting from 212201222011221 its reverse (122110222102212), we obtain a palindrome (90090999909009).

The spelling of 212201222011221 in words is "two hundred twelve trillion, two hundred one billion, two hundred twenty-two million, eleven thousand, two hundred twenty-one".