216233321 has 4 divisors (see below), whose sum is σ = 219460752. Its totient is φ = 213005892.

The previous prime is 216233317. The next prime is 216233333. The reversal of 216233321 is 123332612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 216233321 - 2² = 216233317 is a prime.

It is a super-2 number, since 2×216233321² = 93513698221378082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216233351) 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, 1613615 + ... + 1613748.

It is an arithmetic number, because the mean of its divisors is an integer number (54865188).

Almost surely, 2^216233321 is an apocalyptic number.

It is an amenable number.

216233321 is a deficient number, since it is larger than the sum of its proper divisors (3227431).

216233321 is an equidigital number, since it uses as much as digits as its factorization.

216233321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3227430.

The product of its digits is 1296, while the sum is 23.

The square root of 216233321 is about 14704.8740559040. The cubic root of 216233321 is about 600.2159602223.

Adding to 216233321 its reverse (123332612), we get a palindrome (339565933).

The spelling of 216233321 in words is "two hundred sixteen million, two hundred thirty-three thousand, three hundred twenty-one".