212220404 has 24 divisors (see below), whose sum is σ = 412020000. Its totient is φ = 94827680.

The previous prime is 212220373. The next prime is 212220409. The reversal of 212220404 is 404022212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212220409) 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, 38279 + ... + 43470.

It is an arithmetic number, because the mean of its divisors is an integer number (17167500).

Almost surely, 2^212220404 is an apocalyptic number.

It is an amenable number.

212220404 is a deficient number, since it is larger than the sum of its proper divisors (199799596).

212220404 is a wasteful number, since it uses less digits than its factorization.

212220404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81823 (or 81821 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 212220404 is about 14567.7865168323. The cubic root of 212220404 is about 596.4797609947.

Adding to 212220404 its reverse (404022212), we get a palindrome (616242616).

The spelling of 212220404 in words is "two hundred twelve million, two hundred twenty thousand, four hundred four".