1030685021 has 2 divisors, whose sum is σ = 1030685022. Its totient is φ = 1030685020.

The previous prime is 1030685009. The next prime is 1030685063. The reversal of 1030685021 is 1205860301.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 546904996 + 483780025 = 23386^2 + 21995^2 .

It is a cyclic number.

It is not a de Polignac number, because 1030685021 - 2¹⁴ = 1030668637 is a prime.

It is a super-2 number, since 2×1030685021² = 2124623225027540882, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1030685081) 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, 515342510 + 515342511.

It is an arithmetic number, because the mean of its divisors is an integer number (515342511).

Almost surely, 2^1030685021 is an apocalyptic number.

It is an amenable number.

1030685021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1030685021 is an equidigital number, since it uses as much as digits as its factorization.

1030685021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 1030685021 is about 32104.2835303951. The cubic root of 1030685021 is about 1010.1254691691.

The spelling of 1030685021 in words is "one billion, thirty million, six hundred eighty-five thousand, twenty-one".