212023221 has 8 divisors (see below), whose sum is σ = 283943904. Its totient is φ = 140725680.

The previous prime is 212023199. The next prime is 212023241. The reversal of 212023221 is 122320212.

It is a happy number.

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

It is not a de Polignac number, because 212023221 - 2⁷ = 212023093 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 212023221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212023241) 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, 154990 + ... + 156351.

It is an arithmetic number, because the mean of its divisors is an integer number (35492988).

Almost surely, 2^212023221 is an apocalyptic number.

It is an amenable number.

212023221 is a deficient number, since it is larger than the sum of its proper divisors (71920683).

212023221 is a wasteful number, since it uses less digits than its factorization.

212023221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311571.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 212023221 is about 14561.0171691403. The cubic root of 212023221 is about 596.2949655140.

Adding to 212023221 its reverse (122320212), we get a palindrome (334343433).

The spelling of 212023221 in words is "two hundred twelve million, twenty-three thousand, two hundred twenty-one".