850501021 has 2 divisors, whose sum is σ = 850501022. Its totient is φ = 850501020.

The previous prime is 850500997. The next prime is 850501039. The reversal of 850501021 is 120105058.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 437395396 + 413105625 = 20914^2 + 20325^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-850501021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 850500983 and 850501001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (850501621) 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, 425250510 + 425250511.

It is an arithmetic number, because the mean of its divisors is an integer number (425250511).

Almost surely, 2^850501021 is an apocalyptic number.

It is an amenable number.

850501021 is a deficient number, since it is larger than the sum of its proper divisors (1).

850501021 is an equidigital number, since it uses as much as digits as its factorization.

850501021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 400, while the sum is 22.

The square root of 850501021 is about 29163.3506476879. The cubic root of 850501021 is about 947.4543187784.

Adding to 850501021 its reverse (120105058), we get a palindrome (970606079).

The spelling of 850501021 in words is "eight hundred fifty million, five hundred one thousand, twenty-one".