16233121 has 4 divisors (see below), whose sum is σ = 16671892. Its totient is φ = 15794352.

The previous prime is 16233067. The next prime is 16233131. The reversal of 16233121 is 12133261.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13608721 + 2624400 = 3689^2 + 1620^2 .

It is a cyclic number.

It is not a de Polignac number, because 16233121 - 2⁹ = 16232609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16233131) 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, 219330 + ... + 219403.

It is an arithmetic number, because the mean of its divisors is an integer number (4167973).

Almost surely, 2^16233121 is an apocalyptic number.

It is an amenable number.

16233121 is a deficient number, since it is larger than the sum of its proper divisors (438771).

16233121 is an equidigital number, since it uses as much as digits as its factorization.

16233121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438770.

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

The square root of 16233121 is about 4029.0347479266. The cubic root of 16233121 is about 253.2021225344.

Adding to 16233121 its reverse (12133261), we get a palindrome (28366382).

The spelling of 16233121 in words is "sixteen million, two hundred thirty-three thousand, one hundred twenty-one".