212143321 has 8 divisors (see below), whose sum is σ = 230559560. Its totient is φ = 194026752.

The previous prime is 212143319. The next prime is 212143333. The reversal of 212143321 is 123341212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4096 + 212139225 = 64^2 + 14565^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 212143321 - 2¹ = 212143319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212143301) 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 7 ways as a sum of consecutive naturals, for example, 73440 + ... + 76273.

It is an arithmetic number, because the mean of its divisors is an integer number (28819945).

Almost surely, 2^212143321 is an apocalyptic number.

It is an amenable number.

212143321 is a deficient number, since it is larger than the sum of its proper divisors (18416239).

212143321 is a wasteful number, since it uses less digits than its factorization.

212143321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149835.

The product of its digits is 288, while the sum is 19.

The square root of 212143321 is about 14565.1406103752. The cubic root of 212143321 is about 596.4075341707.

Adding to 212143321 its reverse (123341212), we get a palindrome (335484533).

The spelling of 212143321 in words is "two hundred twelve million, one hundred forty-three thousand, three hundred twenty-one".