212110221 has 4 divisors (see below), whose sum is σ = 282813632. Its totient is φ = 141406812.

The previous prime is 212110211. The next prime is 212110259. The reversal of 212110221 is 122011212.

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 212110221 - 2⁵ = 212110189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212110197 and 212110206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212110211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35351701 + ... + 35351706.

It is an arithmetic number, because the mean of its divisors is an integer number (70703408).

Almost surely, 2^212110221 is an apocalyptic number.

It is an amenable number.

212110221 is a deficient number, since it is larger than the sum of its proper divisors (70703411).

212110221 is an equidigital number, since it uses as much as digits as its factorization.

212110221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70703410.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 212110221 is about 14564.0042914028. The cubic root of 212110221 is about 596.3765140784.

Adding to 212110221 its reverse (122011212), we get a palindrome (334121433).

Subtracting from 212110221 its reverse (122011212), we obtain a palindrome (90099009).

The spelling of 212110221 in words is "two hundred twelve million, one hundred ten thousand, two hundred twenty-one".