16116221 has 8 divisors (see below), whose sum is σ = 18615744. Its totient is φ = 13789120.

The previous prime is 16116197. The next prime is 16116227. The reversal of 16116221 is 12261161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16116221 - 2¹⁸ = 15854077 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 16116193 and 16116202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16116227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42905 + ... + 43278.

It is an arithmetic number, because the mean of its divisors is an integer number (2326968).

Almost surely, 2^16116221 is an apocalyptic number.

16116221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16116221 is a deficient number, since it is larger than the sum of its proper divisors (2499523).

16116221 is a wasteful number, since it uses less digits than its factorization.

16116221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86211.

The product of its digits is 144, while the sum is 20.

The square root of 16116221 is about 4014.5013388963. The cubic root of 16116221 is about 252.5928606591.

Adding to 16116221 its reverse (12261161), we get a palindrome (28377382).

The spelling of 16116221 in words is "sixteen million, one hundred sixteen thousand, two hundred twenty-one".