16821042 has 64 divisors (see below), whose sum is σ = 41057280. Its totient is φ = 4487616.

The previous prime is 16821019. The next prime is 16821071. The reversal of 16821042 is 24012861.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 85288 + ... + 85484.

It is an arithmetic number, because the mean of its divisors is an integer number (641520).

Almost surely, 2^16821042 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16821042, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20528640).

16821042 is an abundant number, since it is smaller than the sum of its proper divisors (24236238).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16821042 is a wasteful number, since it uses less digits than its factorization.

16821042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335.

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 16821042 is about 4101.3463643053. The cubic root of 16821042 is about 256.2227167462. Note that the first 3 decimals are identical.

The spelling of 16821042 in words is "sixteen million, eight hundred twenty-one thousand, forty-two".