835820221 has 2 divisors, whose sum is σ = 835820222. Its totient is φ = 835820220.

The previous prime is 835820213. The next prime is 835820261. The reversal of 835820221 is 122028538.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 766514596 + 69305625 = 27686^2 + 8325^2 .

It is a cyclic number.

It is not a de Polignac number, because 835820221 - 2³ = 835820213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (835820261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 417910110 + 417910111.

It is an arithmetic number, because the mean of its divisors is an integer number (417910111).

Almost surely, 2^835820221 is an apocalyptic number.

It is an amenable number.

835820221 is a deficient number, since it is larger than the sum of its proper divisors (1).

835820221 is an equidigital number, since it uses as much as digits as its factorization.

835820221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 835820221 is about 28910.5555290797. Note that the first 4 decimals coincide. The cubic root of 835820221 is about 941.9711995889.

Adding to 835820221 its reverse (122028538), we get a palindrome (957848759).

The spelling of 835820221 in words is "eight hundred thirty-five million, eight hundred twenty thousand, two hundred twenty-one".