16501121 has 16 divisors (see below), whose sum is σ = 20786304. Its totient is φ = 12749184.

The previous prime is 16501117. The next prime is 16501123. The reversal of 16501121 is 12110561.

It is not a de Polignac number, because 16501121 - 2² = 16501117 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 16501121.

It is not an unprimeable number, because it can be changed into a prime (16501123) 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 15 ways as a sum of consecutive naturals, for example, 1805 + ... + 6021.

It is an arithmetic number, because the mean of its divisors is an integer number (1299144).

Almost surely, 2^16501121 is an apocalyptic number.

It is an amenable number.

16501121 is a deficient number, since it is larger than the sum of its proper divisors (4285183).

16501121 is a wasteful number, since it uses less digits than its factorization.

16501121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4280.

The product of its (nonzero) digits is 60, while the sum is 17.

The square root of 16501121 is about 4062.1571855358. The cubic root of 16501121 is about 254.5879337385.

Adding to 16501121 its reverse (12110561), we get a palindrome (28611682).

The spelling of 16501121 in words is "sixteen million, five hundred one thousand, one hundred twenty-one".