212231630 has 32 divisors (see below), whose sum is σ = 422531424. Its totient is φ = 76242816.

The previous prime is 212231629. The next prime is 212231633. The reversal of 212231630 is 36132212.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212231633) 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, 17252 + ... + 26871.

It is an arithmetic number, because the mean of its divisors is an integer number (13204107).

Almost surely, 2^212231630 is an apocalyptic number.

212231630 is a deficient number, since it is larger than the sum of its proper divisors (210299794).

212231630 is a wasteful number, since it uses less digits than its factorization.

212231630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44180.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 212231630 is about 14568.1718139237. The cubic root of 212231630 is about 596.4902783054.

Adding to 212231630 its reverse (36132212), we get a palindrome (248363842).

The spelling of 212231630 in words is "two hundred twelve million, two hundred thirty-one thousand, six hundred thirty".