216321353 has 8 divisors (see below), whose sum is σ = 226297800. Its totient is φ = 206512768.

The previous prime is 216321341. The next prime is 216321361. The reversal of 216321353 is 353123612.

216321353 is digitally balanced in base 2, 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 4 ways, for example, as 49730704 + 166590649 = 7052^2 + 12907^2 .

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 216321353 - 2⁸ = 216321097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216320353) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39326 + ... + 44487.

It is an arithmetic number, because the mean of its divisors is an integer number (28287225).

Almost surely, 2^216321353 is an apocalyptic number.

It is an amenable number.

216321353 is a deficient number, since it is larger than the sum of its proper divisors (9976447).

216321353 is an equidigital number, since it uses as much as digits as its factorization.

216321353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83931.

The product of its digits is 3240, while the sum is 26.

The square root of 216321353 is about 14707.8670445446. The cubic root of 216321353 is about 600.2974016368.

Adding to 216321353 its reverse (353123612), we get a palindrome (569444965).

The spelling of 216321353 in words is "two hundred sixteen million, three hundred twenty-one thousand, three hundred fifty-three".