16221353 has 4 divisors (see below), whose sum is σ = 16780740. Its totient is φ = 15661968.

The previous prime is 16221323. The next prime is 16221379. The reversal of 16221353 is 35312261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35312261 = 431 ⋅81931.

It can be written as a sum of positive squares in 2 ways, for example, as 8779369 + 7441984 = 2963^2 + 2728^2 .

It is a cyclic number.

It is not a de Polignac number, because 16221353 - 2⁸ = 16221097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16221313) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 279650 + ... + 279707.

It is an arithmetic number, because the mean of its divisors is an integer number (4195185).

Almost surely, 2^16221353 is an apocalyptic number.

It is an amenable number.

16221353 is a deficient number, since it is larger than the sum of its proper divisors (559387).

16221353 is an equidigital number, since it uses as much as digits as its factorization.

16221353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559386.

The product of its digits is 1080, while the sum is 23.

The square root of 16221353 is about 4027.5740837382. The cubic root of 16221353 is about 253.1409224958.

The spelling of 16221353 in words is "sixteen million, two hundred twenty-one thousand, three hundred fifty-three".