16221450 has 72 divisors (see below), whose sum is σ = 46818432. Its totient is φ = 3706080.

The previous prime is 16221433. The next prime is 16221467. The reversal of 16221450 is 5412261.

16221450 = T₁₉ + T₂₀ + ... + T₄₅₉.

16221450 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (16221433) and next prime (16221467).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 6247 + ... + 8453.

It is an arithmetic number, because the mean of its divisors is an integer number (650256).

Almost surely, 2^16221450 is an apocalyptic number.

16221450 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 16221450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23409216).

16221450 is an abundant number, since it is smaller than the sum of its proper divisors (30596982).

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

16221450 is a wasteful number, since it uses less digits than its factorization.

16221450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2236 (or 2224 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 16221450 is about 4027.5861257085. The cubic root of 16221450 is about 253.1414270699.

It can be divided in two parts, 162 and 21450, that added together give a palindrome (21612).

The spelling of 16221450 in words is "sixteen million, two hundred twenty-one thousand, four hundred fifty".