212220110221 has 4 divisors (see below), whose sum is σ = 242537268832. Its totient is φ = 181902951612.

The previous prime is 212220110149. The next prime is 212220110251. The reversal of 212220110221 is 122011022212.

It is a happy number.

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 212220110221 - 2¹¹ = 212220108173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212220110195 and 212220110204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212220110251) 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, 15158579295 + ... + 15158579308.

It is an arithmetic number, because the mean of its divisors is an integer number (60634317208).

Almost surely, 2^212220110221 is an apocalyptic number.

It is an amenable number.

212220110221 is a deficient number, since it is larger than the sum of its proper divisors (30317158611).

212220110221 is an equidigital number, since it uses as much as digits as its factorization.

212220110221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30317158610.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 212220110221 its reverse (122011022212), we get a palindrome (334231132433).

The spelling of 212220110221 in words is "two hundred twelve billion, two hundred twenty million, one hundred ten thousand, two hundred twenty-one".