212122212110221 has 4 divisors (see below), whose sum is σ = 242425385268832. Its totient is φ = 181819038951612.

The previous prime is 212122212110203. The next prime is 212122212110317. The reversal of 212122212110221 is 122011212221212.

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 212122212110221 - 2⁵ = 212122212110189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212122212110192 and 212122212110201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212122212113221) 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, 15151586579295 + ... + 15151586579308.

It is an arithmetic number, because the mean of its divisors is an integer number (60606346317208).

Almost surely, 2^{212122212110221} is an apocalyptic number.

It is an amenable number.

212122212110221 is a deficient number, since it is larger than the sum of its proper divisors (30303173158611).

212122212110221 is an equidigital number, since it uses as much as digits as its factorization.

212122212110221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30303173158610.

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

Adding to 212122212110221 its reverse (122011212221212), we get a palindrome (334133424331433).

The spelling of 212122212110221 in words is "two hundred twelve trillion, one hundred twenty-two billion, two hundred twelve million, one hundred ten thousand, two hundred twenty-one".