1030021 has 2 divisors, whose sum is σ = 1030022. Its totient is φ = 1030020.

The previous prime is 1030019. The next prime is 1030027. The reversal of 1030021 is 1200301.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 784996 + 245025 = 886^2 + 495^2 .

It is a cyclic number.

It is not a de Polignac number, because 1030021 - 2¹ = 1030019 is a prime.

Together with 1030019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1029986 and 1030013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1030027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 515010 + 515011.

It is an arithmetic number, because the mean of its divisors is an integer number (515011).

2^1030021 is an apocalyptic number.

It is an amenable number.

1030021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1030021 is an equidigital number, since it uses as much as digits as its factorization.

1030021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6, while the sum is 7.

The square root of 1030021 is about 1014.8995024139. The cubic root of 1030021 is about 100.9908497412.

Adding to 1030021 its reverse (1200301), we get a palindrome (2230322).

The spelling of 1030021 in words is "one million, thirty thousand, twenty-one".