16773121 has 4 divisors (see below), whose sum is σ = 16812292. Its totient is φ = 16733952.

The previous prime is 16773091. The next prime is 16773131. The reversal of 16773121 is 12137761.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12137761 = 197 ⋅61613.

It can be written as a sum of positive squares in 2 ways, for example, as 1718721 + 15054400 = 1311^2 + 3880^2 .

It is a cyclic number.

It is not a de Polignac number, because 16773121 - 2⁷ = 16772993 is a prime.

It is the 4096-th Hogben number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16773121.

It is not an unprimeable number, because it can be changed into a prime (16773131) by changing a digit.

It is a nontrivial repunit in base 4095.

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 3 ways as a sum of consecutive naturals, for example, 18936 + ... + 19801.

It is an arithmetic number, because the mean of its divisors is an integer number (4203073).

It is a Proth number, since it is equal to 4095 ⋅ 2¹² + 1 and 4095 < 2¹².

It is a Poulet number, since it divides 2^16773120-1.

Almost surely, 2^16773121 is an apocalyptic number.

It is an amenable number.

16773121 is a deficient number, since it is larger than the sum of its proper divisors (39171).

16773121 is an equidigital number, since it uses as much as digits as its factorization.

16773121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39170.

The product of its digits is 1764, while the sum is 28.

The square root of 16773121 is about 4095.5000915639. The cubic root of 16773121 is about 255.9791700581.

The spelling of 16773121 in words is "sixteen million, seven hundred seventy-three thousand, one hundred twenty-one".