803650021 has 2 divisors, whose sum is σ = 803650022. Its totient is φ = 803650020.

The previous prime is 803650019. The next prime is 803650093. The reversal of 803650021 is 120056308.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 785680900 + 17969121 = 28030^2 + 4239^2 .

It is a cyclic number.

It is not a de Polignac number, because 803650021 - 2¹ = 803650019 is a prime.

Together with 803650019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (803650621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 401825010 + 401825011.

It is an arithmetic number, because the mean of its divisors is an integer number (401825011).

Almost surely, 2^803650021 is an apocalyptic number.

It is an amenable number.

803650021 is a deficient number, since it is larger than the sum of its proper divisors (1).

803650021 is an equidigital number, since it uses as much as digits as its factorization.

803650021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 803650021 is about 28348.7216819383. The cubic root of 803650021 is about 929.7274497124.

The spelling of 803650021 in words is "eight hundred three million, six hundred fifty thousand, twenty-one".