16921086 has 64 divisors (see below), whose sum is σ = 44126208. Its totient is φ = 4197888.

The previous prime is 16921067. The next prime is 16921097. The reversal of 16921086 is 68012961.

It is a congruent number.

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, 8371 + ... + 10193.

It is an arithmetic number, because the mean of its divisors is an integer number (689472).

Almost surely, 2^16921086 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16921086, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22063104).

16921086 is an abundant number, since it is smaller than the sum of its proper divisors (27205122).

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

16921086 is a wasteful number, since it uses less digits than its factorization.

16921086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1865.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 16921086 is about 4113.5247659398. The cubic root of 16921086 is about 256.7296788752.

The spelling of 16921086 in words is "sixteen million, nine hundred twenty-one thousand, eighty-six".