1003000000021 has 2 divisors, whose sum is σ = 1003000000022. Its totient is φ = 1003000000020.

The previous prime is 1002999999923. The next prime is 1003000000027. The reversal of 1003000000021 is 1200000003001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 734815841796 + 268184158225 = 857214^2 + 517865^2 .

It is a cyclic number.

It is not a de Polignac number, because 1003000000021 - 2⁷ = 1002999999893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1002999999950 and 1003000000013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1003000000027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 501500000010 + 501500000011.

It is an arithmetic number, because the mean of its divisors is an integer number (501500000011).

Almost surely, 2^{1003000000021} is an apocalyptic number.

It is an amenable number.

1003000000021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1003000000021 is an equidigital number, since it uses as much as digits as its factorization.

1003000000021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6, while the sum is 7.

Adding to 1003000000021 its reverse (1200000003001), we get a palindrome (2203000003022).

The spelling of 1003000000021 in words is "one trillion, three billion, twenty-one", and thus it is an aban number and an uban number.