16230921 has 24 divisors (see below), whose sum is σ = 26115264. Its totient is φ = 8782560.

The previous prime is 16230919. The next prime is 16230953. The reversal of 16230921 is 12903261.

It is not a de Polignac number, because 16230921 - 2¹ = 16230919 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 16230891 and 16230900.

It is not an unprimeable number, because it can be changed into a prime (16230911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6511 + ... + 8651.

It is an arithmetic number, because the mean of its divisors is an integer number (1088136).

Almost surely, 2^16230921 is an apocalyptic number.

It is an amenable number.

16230921 is a deficient number, since it is larger than the sum of its proper divisors (9884343).

16230921 is a wasteful number, since it uses less digits than its factorization.

16230921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2189 (or 2170 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 16230921 is about 4028.7617204297. The cubic root of 16230921 is about 253.1906835792.

The spelling of 16230921 in words is "sixteen million, two hundred thirty thousand, nine hundred twenty-one".