16910421 has 16 divisors (see below), whose sum is σ = 24675840. Its totient is φ = 10215920.

The previous prime is 16910419. The next prime is 16910429. The reversal of 16910421 is 12401961.

It is not a de Polignac number, because 16910421 - 2¹ = 16910419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16910391 and 16910400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16910429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13216 + ... + 14438.

It is an arithmetic number, because the mean of its divisors is an integer number (1542240).

Almost surely, 2^16910421 is an apocalyptic number.

16910421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16910421 is a deficient number, since it is larger than the sum of its proper divisors (7765419).

16910421 is a wasteful number, since it uses less digits than its factorization.

16910421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1656.

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

The square root of 16910421 is about 4112.2282281021. The cubic root of 16910421 is about 256.6757304571.

The spelling of 16910421 in words is "sixteen million, nine hundred ten thousand, four hundred twenty-one".