1002403021 has 2 divisors, whose sum is σ = 1002403022. Its totient is φ = 1002403020.

The previous prime is 1002402983. The next prime is 1002403033. The reversal of 1002403021 is 1203042001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 976250025 + 26152996 = 31245^2 + 5114^2 .

It is a cyclic number.

It is not a de Polignac number, because 1002403021 - 2¹⁵ = 1002370253 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1002402992 and 1002403010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1002403421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 501201510 + 501201511.

It is an arithmetic number, because the mean of its divisors is an integer number (501201511).

Almost surely, 2^1002403021 is an apocalyptic number.

It is an amenable number.

1002403021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1002403021 is an equidigital number, since it uses as much as digits as its factorization.

1002403021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 1002403021 is about 31660.7489014395. The cubic root of 1002403021 is about 1000.8003662430.

Adding to 1002403021 its reverse (1203042001), we get a palindrome (2205445022).

The spelling of 1002403021 in words is "one billion, two million, four hundred three thousand, twenty-one".