16120221 has 16 divisors (see below), whose sum is σ = 23377536. Its totient is φ = 9821376.

The previous prime is 16120213. The next prime is 16120229. The reversal of 16120221 is 12202161.

It is an interprime number because it is at equal distance from previous prime (16120213) and next prime (16120229).

It is not a de Polignac number, because 16120221 - 2³ = 16120213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16120221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16120229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2011 + ... + 6023.

It is an arithmetic number, because the mean of its divisors is an integer number (1461096).

Almost surely, 2^16120221 is an apocalyptic number.

It is an amenable number.

16120221 is a deficient number, since it is larger than the sum of its proper divisors (7257315).

16120221 is a wasteful number, since it uses less digits than its factorization.

16120221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4132.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 16120221 is about 4014.9995018680. Note that the first 3 decimals coincide. The cubic root of 16120221 is about 252.6137565392.

Adding to 16120221 its reverse (12202161), we get a palindrome (28322382).

The spelling of 16120221 in words is "sixteen million, one hundred twenty thousand, two hundred twenty-one".