212211222011221 has 4 divisors (see below), whose sum is σ = 214194504460032. Its totient is φ = 210227939562412.

The previous prime is 212211222011171. The next prime is 212211222011227. The reversal of 212211222011221 is 122110222112212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212211222011221 - 2⁹ = 212211222010709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212211222011192 and 212211222011201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212211222011227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 991641224245 + ... + 991641224458.

It is an arithmetic number, because the mean of its divisors is an integer number (53548626115008).

Almost surely, 2^{212211222011221} is an apocalyptic number.

It is an amenable number.

212211222011221 is a deficient number, since it is larger than the sum of its proper divisors (1983282448811).

212211222011221 is a wasteful number, since it uses less digits than its factorization.

212211222011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1983282448810.

The product of its (nonzero) digits is 256, while the sum is 22.

Adding to 212211222011221 its reverse (122110222112212), we get a palindrome (334321444123433).

The spelling of 212211222011221 in words is "two hundred twelve trillion, two hundred eleven billion, two hundred twenty-two million, eleven thousand, two hundred twenty-one".