16921369 has 2 divisors, whose sum is σ = 16921370. Its totient is φ = 16921368.

The previous prime is 16921361. The next prime is 16921379. The reversal of 16921369 is 96312961.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14707225 + 2214144 = 3835^2 + 1488^2 .

It is a cyclic number.

It is not a de Polignac number, because 16921369 - 2³ = 16921361 is a prime.

It is a super-2 number, since 2×16921369² = 572665457668322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16921361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8460684 + 8460685.

It is an arithmetic number, because the mean of its divisors is an integer number (8460685).

Almost surely, 2^16921369 is an apocalyptic number.

It is an amenable number.

16921369 is a deficient number, since it is larger than the sum of its proper divisors (1).

16921369 is an equidigital number, since it uses as much as digits as its factorization.

16921369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17496, while the sum is 37.

The square root of 16921369 is about 4113.5591645192. The cubic root of 16921369 is about 256.7311101090.

The spelling of 16921369 in words is "sixteen million, nine hundred twenty-one thousand, three hundred sixty-nine".