16842121 has 16 divisors (see below), whose sum is σ = 18475776. Its totient is φ = 15291136.

The previous prime is 16842109. The next prime is 16842131. The reversal of 16842121 is 12124861.

It is a cyclic number.

It is not a de Polignac number, because 16842121 - 2²³ = 8453513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16842131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85395 + ... + 85591.

It is an arithmetic number, because the mean of its divisors is an integer number (1154736).

Almost surely, 2^16842121 is an apocalyptic number.

It is an amenable number.

16842121 is a deficient number, since it is larger than the sum of its proper divisors (1633655).

16842121 is a wasteful number, since it uses less digits than its factorization.

16842121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368.

The product of its digits is 768, while the sum is 25.

The square root of 16842121 is about 4103.9153256372. The cubic root of 16842121 is about 256.3296991039.

Adding to 16842121 its reverse (12124861), we get a palindrome (28966982).

The spelling of 16842121 in words is "sixteen million, eight hundred forty-two thousand, one hundred twenty-one".