1021000073 has 2 divisors, whose sum is σ = 1021000074. Its totient is φ = 1021000072.

The previous prime is 1021000063. The next prime is 1021000103. The reversal of 1021000073 is 3700001201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 711662329 + 309337744 = 26677^2 + 17588^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021000073 - 2⁶ = 1021000009 is a prime.

It is a super-2 number, since 2×1021000073² = 2084882298132010658, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1021000063) 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, 510500036 + 510500037.

It is an arithmetic number, because the mean of its divisors is an integer number (510500037).

Almost surely, 2^1021000073 is an apocalyptic number.

It is an amenable number.

1021000073 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021000073 is an equidigital number, since it uses as much as digits as its factorization.

1021000073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42, while the sum is 14.

The square root of 1021000073 is about 31953.0917596404. The cubic root of 1021000073 is about 1006.9515877831.

Adding to 1021000073 its reverse (3700001201), we get a palindrome (4721001274).

The spelling of 1021000073 in words is "one billion, twenty-one million, seventy-three", and thus it is an aban number and an uban number.