212112222100221 has 4 divisors (see below), whose sum is σ = 282816296133632. Its totient is φ = 141408148066812.

The previous prime is 212112222100153. The next prime is 212112222100243. The reversal of 212112222100221 is 122001222211212.

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 212112222100221 - 2⁴⁵ = 176927850011389 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 (212112222100421) 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, 35352037016701 + ... + 35352037016706.

It is an arithmetic number, because the mean of its divisors is an integer number (70704074033408).

Almost surely, 2^{212112222100221} is an apocalyptic number.

It is an amenable number.

212112222100221 is a deficient number, since it is larger than the sum of its proper divisors (70704074033411).

212112222100221 is an equidigital number, since it uses as much as digits as its factorization.

212112222100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70704074033410.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 212112222100221 its reverse (122001222211212), we get a palindrome (334113444311433).

The spelling of 212112222100221 in words is "two hundred twelve trillion, one hundred twelve billion, two hundred twenty-two million, one hundred thousand, two hundred twenty-one".