16221015 has 24 divisors (see below), whose sum is σ = 28518048. Its totient is φ = 8527680.

The previous prime is 16220977. The next prime is 16221017. The reversal of 16221015 is 51012261.

It is not a de Polignac number, because 16221015 - 2⁶ = 16220951 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16221017) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 657 + ... + 5733.

It is an arithmetic number, because the mean of its divisors is an integer number (1188252).

Almost surely, 2^16221015 is an apocalyptic number.

16221015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

16221015 is a deficient number, since it is larger than the sum of its proper divisors (12297033).

16221015 is a wasteful number, since it uses less digits than its factorization.

16221015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5159 (or 5156 counting only the distinct ones).

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

The square root of 16221015 is about 4027.5321227769. The cubic root of 16221015 is about 253.1391642737.

Adding to 16221015 its reverse (51012261), we get a palindrome (67233276).

The spelling of 16221015 in words is "sixteen million, two hundred twenty-one thousand, fifteen".