212643441 has 16 divisors (see below), whose sum is σ = 328725120. Its totient is φ = 135598320.

The previous prime is 212643439. The next prime is 212643449. The reversal of 212643441 is 144346212.

It is a happy number.

212643441 is a `hidden beast` number, since 2 + 12 + 643 + 4 + 4 + 1 = 666.

It is not a de Polignac number, because 212643441 - 2¹ = 212643439 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (212643449) 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, 170590 + ... + 171831.

It is an arithmetic number, because the mean of its divisors is an integer number (20545320).

Almost surely, 2^212643441 is an apocalyptic number.

It is an amenable number.

212643441 is a deficient number, since it is larger than the sum of its proper divisors (116081679).

212643441 is a wasteful number, since it uses less digits than its factorization.

212643441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342453 (or 342447 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

The square root of 212643441 is about 14582.2988928358. The cubic root of 212643441 is about 596.8758358988.

Adding to 212643441 its reverse (144346212), we get a palindrome (356989653).

It can be divided in two parts, 21 and 2643441, that added together give a palindrome (2643462).

The spelling of 212643441 in words is "two hundred twelve million, six hundred forty-three thousand, four hundred forty-one".