16105221 has 36 divisors (see below), whose sum is σ = 26723424. Its totient is φ = 9321840.

The previous prime is 16105189. The next prime is 16105241. The reversal of 16105221 is 12250161.

16105221 is a `hidden beast` number, since 1 + 610 + 52 + 2 + 1 = 666.

It is not a de Polignac number, because 16105221 - 2⁵ = 16105189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16105194 and 16105203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16105241) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 24726 + ... + 25368.

Almost surely, 2^16105221 is an apocalyptic number.

16105221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16105221 is a deficient number, since it is larger than the sum of its proper divisors (10618203).

16105221 is a wasteful number, since it uses less digits than its factorization.

16105221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694 (or 680 counting only the distinct ones).

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

The square root of 16105221 is about 4013.1310718689. The cubic root of 16105221 is about 252.5353791553.

Adding to 16105221 its reverse (12250161), we get a palindrome (28355382).

The spelling of 16105221 in words is "sixteen million, one hundred five thousand, two hundred twenty-one".