16208421 has 8 divisors (see below), whose sum is σ = 21977760. Its totient is φ = 10622352.

The previous prime is 16208393. The next prime is 16208431. The reversal of 16208421 is 12480261.

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

It is not a de Polignac number, because 16208421 - 2²² = 12014117 is a prime.

It is a super-2 number, since 2×16208421² = 525425822626482, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16208391 and 16208400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16208431) 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 7 ways as a sum of consecutive naturals, for example, 45610 + ... + 45963.

It is an arithmetic number, because the mean of its divisors is an integer number (2747220).

Almost surely, 2^16208421 is an apocalyptic number.

It is an amenable number.

16208421 is a deficient number, since it is larger than the sum of its proper divisors (5769339).

16208421 is an equidigital number, since it uses as much as digits as its factorization.

16208421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91635.

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 16208421 is about 4025.9683307249. The cubic root of 16208421 is about 253.0736348755.

Adding to 16208421 its reverse (12480261), we get a palindrome (28688682).

The spelling of 16208421 in words is "sixteen million, two hundred eight thousand, four hundred twenty-one".