16234221 has 16 divisors (see below), whose sum is σ = 22118400. Its totient is φ = 10589040.

The previous prime is 16234217. The next prime is 16234259. The reversal of 16234221 is 12243261.

It is not a de Polignac number, because 16234221 - 2² = 16234217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16234261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42196 + ... + 42578.

It is an arithmetic number, because the mean of its divisors is an integer number (1382400).

Almost surely, 2^16234221 is an apocalyptic number.

It is an amenable number.

16234221 is a deficient number, since it is larger than the sum of its proper divisors (5884179).

16234221 is a wasteful number, since it uses less digits than its factorization.

16234221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656.

The product of its digits is 576, while the sum is 21.

The square root of 16234221 is about 4029.1712547371. The cubic root of 16234221 is about 253.2078416245.

Adding to 16234221 its reverse (12243261), we get a palindrome (28477482).

The spelling of 16234221 in words is "sixteen million, two hundred thirty-four thousand, two hundred twenty-one".