16213231 has 4 divisors (see below), whose sum is σ = 16221672. Its totient is φ = 16204792.

The previous prime is 16213207. The next prime is 16213247. The reversal of 16213231 is 13231261.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 16213231 - 2⁷ = 16213103 is a prime.

It is a super-2 number, since 2×16213231² = 525737718918722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16213199 and 16213208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16213331) 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 3 ways as a sum of consecutive naturals, for example, 216 + ... + 5698.

It is an arithmetic number, because the mean of its divisors is an integer number (4055418).

Almost surely, 2^16213231 is an apocalyptic number.

16213231 is a deficient number, since it is larger than the sum of its proper divisors (8441).

16213231 is an equidigital number, since it uses as much as digits as its factorization.

16213231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8440.

The product of its digits is 216, while the sum is 19.

The square root of 16213231 is about 4026.5656582254. The cubic root of 16213231 is about 253.0986663861.

Adding to 16213231 its reverse (13231261), we get a palindrome (29444492).

The spelling of 16213231 in words is "sixteen million, two hundred thirteen thousand, two hundred thirty-one".