16911321 has 24 divisors (see below), whose sum is σ = 27141120. Its totient is φ = 9328032.

The previous prime is 16911319. The next prime is 16911343. The reversal of 16911321 is 12311961.

It is not a de Polignac number, because 16911321 - 2¹ = 16911319 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16911291 and 16911300.

It is not an unprimeable number, because it can be changed into a prime (16912321) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2280 + ... + 6246.

It is an arithmetic number, because the mean of its divisors is an integer number (1130880).

Almost surely, 2^16911321 is an apocalyptic number.

It is an amenable number.

16911321 is a deficient number, since it is larger than the sum of its proper divisors (10229799).

16911321 is a wasteful number, since it uses less digits than its factorization.

16911321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4013 (or 4006 counting only the distinct ones).

The product of its digits is 324, while the sum is 24.

The square root of 16911321 is about 4112.3376563702. The cubic root of 16911321 is about 256.6802839424.

The spelling of 16911321 in words is "sixteen million, nine hundred eleven thousand, three hundred twenty-one".