16898721 has 32 divisors (see below), whose sum is σ = 27371520. Its totient is φ = 9064704.

The previous prime is 16898719. The next prime is 16898723. The reversal of 16898721 is 12789861.

It is an interprime number because it is at equal distance from previous prime (16898719) and next prime (16898723).

It is not a de Polignac number, because 16898721 - 2¹ = 16898719 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16898723) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28201 + ... + 28793.

It is an arithmetic number, because the mean of its divisors is an integer number (855360).

Almost surely, 2^16898721 is an apocalyptic number.

It is an amenable number.

16898721 is a deficient number, since it is larger than the sum of its proper divisors (10472799).

16898721 is a wasteful number, since it uses less digits than its factorization.

16898721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 685.

The product of its digits is 48384, while the sum is 42.

The square root of 16898721 is about 4110.8053955399. The cubic root of 16898721 is about 256.6165204408.

It can be divided in two parts, 168 and 98721, that added together give a palindrome (98889).

The spelling of 16898721 in words is "sixteen million, eight hundred ninety-eight thousand, seven hundred twenty-one".