212221110221 has 4 divisors (see below), whose sum is σ = 212482789344. Its totient is φ = 211959431100.

The previous prime is 212221110217. The next prime is 212221110253. The reversal of 212221110221 is 122011122212.

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 212221110221 - 2² = 212221110217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212221110221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212221110721) 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, 130838345 + ... + 130839966.

It is an arithmetic number, because the mean of its divisors is an integer number (53120697336).

Almost surely, 2^212221110221 is an apocalyptic number.

It is an amenable number.

212221110221 is a deficient number, since it is larger than the sum of its proper divisors (261679123).

212221110221 is an equidigital number, since it uses as much as digits as its factorization.

212221110221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261679122.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 212221110221 its reverse (122011122212), we get a palindrome (334232232433).

The spelling of 212221110221 in words is "two hundred twelve billion, two hundred twenty-one million, one hundred ten thousand, two hundred twenty-one".