212210221 has 8 divisors (see below), whose sum is σ = 230585600. Its totient is φ = 194555520.

The previous prime is 212210171. The next prime is 212210237. The reversal of 212210221 is 122012212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 212210221 - 2⁷ = 212210093 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 (212210021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 179556 + ... + 180733.

It is an arithmetic number, because the mean of its divisors is an integer number (28823200).

Almost surely, 2^212210221 is an apocalyptic number.

It is an amenable number.

212210221 is a deficient number, since it is larger than the sum of its proper divisors (18375379).

212210221 is a wasteful number, since it uses less digits than its factorization.

212210221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360339.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 212210221 is about 14567.4370086162. The cubic root of 212210221 is about 596.4702205195.

Adding to 212210221 its reverse (122012212), we get a palindrome (334222433).

The spelling of 212210221 in words is "two hundred twelve million, two hundred ten thousand, two hundred twenty-one".