16091421 has 16 divisors (see below), whose sum is σ = 22619520. Its totient is φ = 10155200.

The previous prime is 16091407. The next prime is 16091441. The reversal of 16091421 is 12419061.

It is a cyclic number.

It is not a de Polignac number, because 16091421 - 2⁵ = 16091389 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 16091391 and 16091400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16091441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5815 + ... + 8123.

It is an arithmetic number, because the mean of its divisors is an integer number (1413720).

Almost surely, 2^16091421 is an apocalyptic number.

It is an amenable number.

16091421 is a deficient number, since it is larger than the sum of its proper divisors (6528099).

16091421 is a wasteful number, since it uses less digits than its factorization.

16091421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2436.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 16091421 is about 4011.4113476431. The cubic root of 16091421 is about 252.4632289688.

The spelling of 16091421 in words is "sixteen million, ninety-one thousand, four hundred twenty-one".