16621242 has 32 divisors (see below), whose sum is σ = 36785664. Its totient is φ = 4964400.

The previous prime is 16621229. The next prime is 16621259. The reversal of 16621242 is 24212661.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2913 + ... + 6459.

It is an arithmetic number, because the mean of its divisors is an integer number (1149552).

Almost surely, 2^16621242 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16621242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18392832).

16621242 is an abundant number, since it is smaller than the sum of its proper divisors (20164422).

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

16621242 is a wasteful number, since it uses less digits than its factorization.

16621242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3634.

The product of its digits is 1152, while the sum is 24.

The square root of 16621242 is about 4076.9157460021. The cubic root of 16621242 is about 255.2042039808.

The spelling of 16621242 in words is "sixteen million, six hundred twenty-one thousand, two hundred forty-two".