1002021073 has 2 divisors, whose sum is σ = 1002021074. Its totient is φ = 1002021072.

The previous prime is 1002021071. The next prime is 1002021109. The reversal of 1002021073 is 3701202001.

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., 901680784 + 100340289 = 30028^2 + 10017^2 .

It is a cyclic number.

It is not a de Polignac number, because 1002021073 - 2¹ = 1002021071 is a prime.

Together with 1002021071, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1002021071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 501010536 + 501010537.

It is an arithmetic number, because the mean of its divisors is an integer number (501010537).

Almost surely, 2^1002021073 is an apocalyptic number.

It is an amenable number.

1002021073 is a deficient number, since it is larger than the sum of its proper divisors (1).

1002021073 is an equidigital number, since it uses as much as digits as its factorization.

1002021073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 1002021073 is about 31654.7164416300. The cubic root of 1002021073 is about 1000.6732376494.

Adding to 1002021073 its reverse (3701202001), we get a palindrome (4703223074).

The spelling of 1002021073 in words is "one billion, two million, twenty-one thousand, seventy-three".