212202221222221 has 4 divisors (see below), whose sum is σ = 213207918953344. Its totient is φ = 211196523491100.

The previous prime is 212202221222129. The next prime is 212202221222237. The reversal of 212202221222221 is 122222122202212.

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 212202221222221 - 2¹¹ = 212202221220173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212202221222261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 502848865245 + ... + 502848865666.

It is an arithmetic number, because the mean of its divisors is an integer number (53301979738336).

Almost surely, 2^{212202221222221} is an apocalyptic number.

It is an amenable number.

212202221222221 is a deficient number, since it is larger than the sum of its proper divisors (1005697731123).

212202221222221 is a wasteful number, since it uses less digits than its factorization.

212202221222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1005697731122.

The product of its (nonzero) digits is 2048, while the sum is 25.

Adding to 212202221222221 its reverse (122222122202212), we get a palindrome (334424343424433).

The spelling of 212202221222221 in words is "two hundred twelve trillion, two hundred two billion, two hundred twenty-one million, two hundred twenty-two thousand, two hundred twenty-one".