16221150 has 144 divisors (see below), whose sum is σ = 49617360. Its totient is φ = 3763200.

The previous prime is 16221143. The next prime is 16221151. The reversal of 16221150 is 5112261.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16221151) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 143494 + ... + 143606.

It is an arithmetic number, because the mean of its divisors is an integer number (344565).

Almost surely, 2^16221150 is an apocalyptic number.

16221150 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 16221150, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24808680).

16221150 is an abundant number, since it is smaller than the sum of its proper divisors (33396210).

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

16221150 is a wasteful number, since it uses less digits than its factorization.

16221150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171 (or 163 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 16221150 is about 4027.5488823849. The cubic root of 16221150 is about 253.1398665251.

Subtracting from 16221150 its reverse (5112261), we obtain a square (11108889 = 3333²).

It can be divided in two parts, 162211 and 50, that added together give a palindrome (162261).

The spelling of 16221150 in words is "sixteen million, two hundred twenty-one thousand, one hundred fifty".