803840221 has 2 divisors, whose sum is σ = 803840222. Its totient is φ = 803840220.

The previous prime is 803840173. The next prime is 803840227. The reversal of 803840221 is 122048308.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 766459225 + 37380996 = 27685^2 + 6114^2 .

It is a cyclic number.

It is not a de Polignac number, because 803840221 - 2¹⁷ = 803709149 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 803840221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (803840227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 401920110 + 401920111.

It is an arithmetic number, because the mean of its divisors is an integer number (401920111).

Almost surely, 2^803840221 is an apocalyptic number.

It is an amenable number.

803840221 is a deficient number, since it is larger than the sum of its proper divisors (1).

803840221 is an equidigital number, since it uses as much as digits as its factorization.

803840221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 803840221 is about 28352.0761320930. The cubic root of 803840221 is about 929.8007901831.

Adding to 803840221 its reverse (122048308), we get a palindrome (925888529).

The spelling of 803840221 in words is "eight hundred three million, eight hundred forty thousand, two hundred twenty-one".