212220244 has 12 divisors (see below), whose sum is σ = 371515284. Its totient is φ = 106073024.

The previous prime is 212220191. The next prime is 212220247. The reversal of 212220244 is 442022212.

212220244 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 125171344 + 87048900 = 11188^2 + 9330^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212220247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6624 + ... + 21640.

It is an arithmetic number, because the mean of its divisors is an integer number (30959607).

Almost surely, 2^212220244 is an apocalyptic number.

It is an amenable number.

212220244 is a deficient number, since it is larger than the sum of its proper divisors (159295040).

212220244 is a wasteful number, since it uses less digits than its factorization.

212220244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18554 (or 18552 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 212220244 is about 14567.7810252626. The cubic root of 212220244 is about 596.4796110927.

Adding to 212220244 its reverse (442022212), we get a palindrome (654242456).

It can be divided in two parts, 2122 and 20244, that added together give a triangular number (22366 = T₂₁₁).

The spelling of 212220244 in words is "two hundred twelve million, two hundred twenty thousand, two hundred forty-four".