213235321 has 8 divisors (see below), whose sum is σ = 233403464. Its totient is φ = 193605120.

The previous prime is 213235307. The next prime is 213235331. The reversal of 213235321 is 123532312.

It can be written as a sum of positive squares in 4 ways, for example, as 15523600 + 197711721 = 3940^2 + 14061^2 .

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 213235321 - 2¹⁹ = 212711033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213235292 and 213235301.

It is not an unprimeable number, because it can be changed into a prime (213235331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133656 + ... + 135241.

It is an arithmetic number, because the mean of its divisors is an integer number (29175433).

Almost surely, 2^213235321 is an apocalyptic number.

It is an amenable number.

213235321 is a deficient number, since it is larger than the sum of its proper divisors (20168143).

213235321 is a wasteful number, since it uses less digits than its factorization.

213235321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268971.

The product of its digits is 1080, while the sum is 22.

The square root of 213235321 is about 14602.5792584735. The cubic root of 213235321 is about 597.4291119953.

Adding to 213235321 its reverse (123532312), we get a palindrome (336767633).

The spelling of 213235321 in words is "two hundred thirteen million, two hundred thirty-five thousand, three hundred twenty-one".