212012221 has 16 divisors (see below), whose sum is σ = 220460800. Its totient is φ = 203793408.

The previous prime is 212012209. The next prime is 212012263. The reversal of 212012221 is 122210212.

It is a happy number.

212012221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 212012221 - 2¹¹ = 212010173 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 (212018221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 559210 + ... + 559588.

It is an arithmetic number, because the mean of its divisors is an integer number (13778800).

Almost surely, 2^212012221 is an apocalyptic number.

It is an amenable number.

212012221 is a deficient number, since it is larger than the sum of its proper divisors (8448579).

212012221 is an equidigital number, since it uses as much as digits as its factorization.

212012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 628.

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

The square root of 212012221 is about 14560.6394433761. The cubic root of 212012221 is about 596.2846531874.

Adding to 212012221 its reverse (122210212), we get a palindrome (334222433).

It can be divided in two parts, 2120 and 12221, that added together give a palindrome (14341).

The spelling of 212012221 in words is "two hundred twelve million, twelve thousand, two hundred twenty-one".