212221130 has 64 divisors (see below), whose sum is σ = 437633280. Its totient is φ = 73382400.

The previous prime is 212221067. The next prime is 212221153. The reversal of 212221130 is 31122212.

212221130 = 80² + 81² + ... + 860².

It is a happy number.

212221130 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 226022 + ... + 226958.

It is an arithmetic number, because the mean of its divisors is an integer number (6838020).

Almost surely, 2^212221130 is an apocalyptic number.

212221130 is an abundant number, since it is smaller than the sum of its proper divisors (225412150).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

212221130 is a wasteful number, since it uses less digits than its factorization.

212221130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1055.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 212221130 is about 14567.8114348038. The cubic root of 212221130 is about 596.4804411741.

Adding to 212221130 its reverse (31122212), we get a palindrome (243343342).

The spelling of 212221130 in words is "two hundred twelve million, two hundred twenty-one thousand, one hundred thirty".