1030403021 has 4 divisors (see below), whose sum is σ = 1055534844. Its totient is φ = 1005271200.

The previous prime is 1030402993. The next prime is 1030403027. The reversal of 1030403021 is 1203040301.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 27984100 + 1002418921 = 5290^2 + 31661^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1030403021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1030402987 and 1030403005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1030403027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12565850 + ... + 12565931.

It is an arithmetic number, because the mean of its divisors is an integer number (263883711).

Almost surely, 2^1030403021 is an apocalyptic number.

It is an amenable number.

1030403021 is a deficient number, since it is larger than the sum of its proper divisors (25131823).

1030403021 is an equidigital number, since it uses as much as digits as its factorization.

1030403021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25131822.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 1030403021 is about 32099.8912926508. The cubic root of 1030403021 is about 1010.0333358275.

Adding to 1030403021 its reverse (1203040301), we get a palindrome (2233443322).

The spelling of 1030403021 in words is "one billion, thirty million, four hundred three thousand, twenty-one".