212212330221 has 4 divisors (see below), whose sum is σ = 282949773632. Its totient is φ = 141474886812.

The previous prime is 212212330193. The next prime is 212212330259. The reversal of 212212330221 is 122033212212.

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 not a de Polignac number, because 212212330221 - 2⁷ = 212212330093 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 (212212330021) 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, 35368721701 + ... + 35368721706.

It is an arithmetic number, because the mean of its divisors is an integer number (70737443408).

Almost surely, 2^212212330221 is an apocalyptic number.

It is an amenable number.

212212330221 is a deficient number, since it is larger than the sum of its proper divisors (70737443411).

212212330221 is an equidigital number, since it uses as much as digits as its factorization.

212212330221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70737443410.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 212212330221 its reverse (122033212212), we get a palindrome (334245542433).

The spelling of 212212330221 in words is "two hundred twelve billion, two hundred twelve million, three hundred thirty thousand, two hundred twenty-one".