212221424 has 20 divisors (see below), whose sum is σ = 412510800. Its totient is φ = 105767040.

The previous prime is 212221423. The next prime is 212221433. The reversal of 212221424 is 424122212.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 212221396 and 212221405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212221423) 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, 16349 + ... + 26300.

It is an arithmetic number, because the mean of its divisors is an integer number (20625540).

Almost surely, 2^212221424 is an apocalyptic number.

It is an amenable number.

212221424 is a deficient number, since it is larger than the sum of its proper divisors (200289376).

212221424 is a wasteful number, since it uses less digits than its factorization.

212221424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42968 (or 42962 counting only the distinct ones).

The product of its digits is 512, while the sum is 20.

The square root of 212221424 is about 14567.8215255405. The cubic root of 212221424 is about 596.4807166182.

Adding to 212221424 its reverse (424122212), we get a palindrome (636343636).

The spelling of 212221424 in words is "two hundred twelve million, two hundred twenty-one thousand, four hundred twenty-four".