16865121 has 32 divisors (see below), whose sum is σ = 27919360. Its totient is φ = 8817984.

The previous prime is 16865119. The next prime is 16865129. The reversal of 16865121 is 12156861.

It is not a de Polignac number, because 16865121 - 2¹ = 16865119 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16865129) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44310 + ... + 44688.

It is an arithmetic number, because the mean of its divisors is an integer number (872480).

Almost surely, 2^16865121 is an apocalyptic number.

It is an amenable number.

16865121 is a deficient number, since it is larger than the sum of its proper divisors (11054239).

16865121 is a wasteful number, since it uses less digits than its factorization.

16865121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565.

The product of its digits is 2880, while the sum is 30.

The square root of 16865121 is about 4106.7165716665. The cubic root of 16865121 is about 256.4463293350.

The spelling of 16865121 in words is "sixteen million, eight hundred sixty-five thousand, one hundred twenty-one".