16580121 has 16 divisors (see below), whose sum is σ = 22629120. Its totient is φ = 10794960.

The previous prime is 16580119. The next prime is 16580129. The reversal of 16580121 is 12108561.

It is not a de Polignac number, because 16580121 - 2¹ = 16580119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16580091 and 16580100.

It is not an unprimeable number, because it can be changed into a prime (16580129) 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, 49926 + ... + 50256.

It is an arithmetic number, because the mean of its divisors is an integer number (1414320).

Almost surely, 2^16580121 is an apocalyptic number.

It is an amenable number.

16580121 is a deficient number, since it is larger than the sum of its proper divisors (6048999).

16580121 is a wasteful number, since it uses less digits than its factorization.

16580121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 676.

The product of its (nonzero) digits is 480, while the sum is 24.

The square root of 16580121 is about 4071.8694723677. The cubic root of 16580121 is about 254.9935715411.

Adding to 16580121 its reverse (12108561), we get a palindrome (28688682).

The spelling of 16580121 in words is "sixteen million, five hundred eighty thousand, one hundred twenty-one".