16898021 has 8 divisors (see below), whose sum is σ = 19557120. Its totient is φ = 14300208.

The previous prime is 16897999. The next prime is 16898023. The reversal of 16898021 is 12089861.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16898021 is a prime.

It is a super-2 number, since 2×16898021² = 571086227432882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16898023) 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 7 ways as a sum of consecutive naturals, for example, 14726 + ... + 15831.

It is an arithmetic number, because the mean of its divisors is an integer number (2444640).

Almost surely, 2^16898021 is an apocalyptic number.

It is an amenable number.

16898021 is a deficient number, since it is larger than the sum of its proper divisors (2659099).

16898021 is an equidigital number, since it uses as much as digits as its factorization.

16898021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30643.

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 16898021 is about 4110.7202531916. The cubic root of 16898021 is about 256.6129770948.

It can be divided in two parts, 168 and 98021, that added together give a palindrome (98189).

The spelling of 16898021 in words is "sixteen million, eight hundred ninety-eight thousand, twenty-one".