212221606 has 8 divisors (see below), whose sum is σ = 319021344. Its totient is φ = 105881160.

The previous prime is 212221589. The next prime is 212221609. The reversal of 212221606 is 606122212.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212221609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113665 + ... + 115516.

It is an arithmetic number, because the mean of its divisors is an integer number (39877668).

Almost surely, 2^212221606 is an apocalyptic number.

212221606 is a deficient number, since it is larger than the sum of its proper divisors (106799738).

212221606 is a wasteful number, since it uses less digits than its factorization.

212221606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229646.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 212221606 is about 14567.8277721835. The cubic root of 212221606 is about 596.4808871311.

Adding to 212221606 its reverse (606122212), we get a palindrome (818343818).

The spelling of 212221606 in words is "two hundred twelve million, two hundred twenty-one thousand, six hundred six".