16221454 has 4 divisors (see below), whose sum is σ = 24332184. Its totient is φ = 8110726.

The previous prime is 16221433. The next prime is 16221467. The reversal of 16221454 is 45412261.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4055362 + ... + 4055365.

It is an arithmetic number, because the mean of its divisors is an integer number (6083046).

Almost surely, 2^16221454 is an apocalyptic number.

16221454 is a deficient number, since it is larger than the sum of its proper divisors (8110730).

16221454 is an equidigital number, since it uses as much as digits as its factorization.

16221454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8110729.

The product of its digits is 1920, while the sum is 25.

The square root of 16221454 is about 4027.5866222839. The cubic root of 16221454 is about 253.1414478770.

The spelling of 16221454 in words is "sixteen million, two hundred twenty-one thousand, four hundred fifty-four".