16825321 has 2 divisors, whose sum is σ = 16825322. Its totient is φ = 16825320.

The previous prime is 16825309. The next prime is 16825331. The reversal of 16825321 is 12352861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12250000 + 4575321 = 3500^2 + 2139^2 .

It is a cyclic number.

It is not a de Polignac number, because 16825321 - 2²³ = 8436713 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16825321.

It is not a weakly prime, because it can be changed into another prime (16825331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8412660 + 8412661.

It is an arithmetic number, because the mean of its divisors is an integer number (8412661).

Almost surely, 2^16825321 is an apocalyptic number.

It is an amenable number.

16825321 is a deficient number, since it is larger than the sum of its proper divisors (1).

16825321 is an equidigital number, since it uses as much as digits as its factorization.

16825321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 28.

The square root of 16825321 is about 4101.8679890996. The cubic root of 16825321 is about 256.2444412040.

The spelling of 16825321 in words is "sixteen million, eight hundred twenty-five thousand, three hundred twenty-one".