16921005 has 16 divisors (see below), whose sum is σ = 27143424. Its totient is φ = 9001280.

The previous prime is 16920983. The next prime is 16921013. The reversal of 16921005 is 50012961.

It is not a de Polignac number, because 16921005 - 2⁸ = 16920749 is a prime.

16921005 is a Rhonda number in base 14.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5692 + ... + 8138.

It is an arithmetic number, because the mean of its divisors is an integer number (1696464).

Almost surely, 2^16921005 is an apocalyptic number.

16921005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16921005 is a deficient number, since it is larger than the sum of its proper divisors (10222419).

16921005 is a wasteful number, since it uses less digits than its factorization.

16921005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2916.

The product of its (nonzero) digits is 540, while the sum is 24.

The square root of 16921005 is about 4113.5149203570. The cubic root of 16921005 is about 256.7292692258.

Adding to 16921005 its reverse (50012961), we get a palindrome (66933966).

The spelling of 16921005 in words is "sixteen million, nine hundred twenty-one thousand, five".