16221550 has 12 divisors (see below), whose sum is σ = 30172176. Its totient is φ = 6488600.

The previous prime is 16221529. The next prime is 16221563. The reversal of 16221550 is 5512261.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 162166 + ... + 162265.

It is an arithmetic number, because the mean of its divisors is an integer number (2514348).

Almost surely, 2^16221550 is an apocalyptic number.

16221550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16221550 is a deficient number, since it is larger than the sum of its proper divisors (13950626).

16221550 is a wasteful number, since it uses less digits than its factorization.

16221550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324443 (or 324438 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 16221550 is about 4027.5985400732. The cubic root of 16221550 is about 253.1419472472.

It can be divided in two parts, 162 and 21550, that added together give a palindrome (21712).

The spelling of 16221550 in words is "sixteen million, two hundred twenty-one thousand, five hundred fifty".