16116421 has 4 divisors (see below), whose sum is σ = 16205644. Its totient is φ = 16027200.

The previous prime is 16116407. The next prime is 16116439. The reversal of 16116421 is 12461161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 236196 + 15880225 = 486^2 + 3985^2 .

It is a cyclic number.

It is not a de Polignac number, because 16116421 - 2¹⁵ = 16083653 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16116392 and 16116401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16116461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44340 + ... + 44701.

It is an arithmetic number, because the mean of its divisors is an integer number (4051411).

Almost surely, 2^16116421 is an apocalyptic number.

It is an amenable number.

16116421 is a deficient number, since it is larger than the sum of its proper divisors (89223).

16116421 is an equidigital number, since it uses as much as digits as its factorization.

16116421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89222.

The product of its digits is 288, while the sum is 22.

The square root of 16116421 is about 4014.5262485130. The cubic root of 16116421 is about 252.5939055353.

Adding to 16116421 its reverse (12461161), we get a palindrome (28577582).

The spelling of 16116421 in words is "sixteen million, one hundred sixteen thousand, four hundred twenty-one".