16530121 has 4 divisors (see below), whose sum is σ = 16639744. Its totient is φ = 16420500.

The previous prime is 16530097. The next prime is 16530127. The reversal of 16530121 is 12103561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16530121 - 2¹⁵ = 16497353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16530127) 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, 54585 + ... + 54886.

It is an arithmetic number, because the mean of its divisors is an integer number (4159936).

Almost surely, 2^16530121 is an apocalyptic number.

It is an amenable number.

16530121 is a deficient number, since it is larger than the sum of its proper divisors (109623).

16530121 is a wasteful number, since it uses less digits than its factorization.

16530121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109622.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 16530121 is about 4065.7251505728. The cubic root of 16530121 is about 254.7369888475.

Adding to 16530121 its reverse (12103561), we get a palindrome (28633682).

The spelling of 16530121 in words is "sixteen million, five hundred thirty thousand, one hundred twenty-one".