16500021121 has 8 divisors (see below), whose sum is σ = 16616808000. Its totient is φ = 16383573360.

The previous prime is 16500021107. The next prime is 16500021127. The reversal of 16500021121 is 12112000561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16500021121 - 2⁹ = 16500020609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16500021127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13275 + ... + 182143.

It is an arithmetic number, because the mean of its divisors is an integer number (2077101000).

Almost surely, 2^16500021121 is an apocalyptic number.

It is an amenable number.

16500021121 is a deficient number, since it is larger than the sum of its proper divisors (116786879).

16500021121 is a wasteful number, since it uses less digits than its factorization.

16500021121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169559.

The product of its (nonzero) digits is 120, while the sum is 19.

Adding to 16500021121 its reverse (12112000561), we get a palindrome (28612021682).

The spelling of 16500021121 in words is "sixteen billion, five hundred million, twenty-one thousand, one hundred twenty-one".