21003330031 has 2 divisors, whose sum is σ = 21003330032. Its totient is φ = 21003330030.

The previous prime is 21003330013. The next prime is 21003330043. The reversal of 21003330031 is 13003330012.

Together with previous prime (21003330013) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21003330031 - 2²⁵ = 20969775599 is a prime.

It is a super-2 number, since 2×21003330031² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21003329987 and 21003330014.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21003330071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501665015 + 10501665016.

It is an arithmetic number, because the mean of its divisors is an integer number (10501665016).

Almost surely, 2^21003330031 is an apocalyptic number.

21003330031 is a deficient number, since it is larger than the sum of its proper divisors (1).

21003330031 is an equidigital number, since it uses as much as digits as its factorization.

21003330031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 16.

Adding to 21003330031 its reverse (13003330012), we get a palindrome (34006660043).

The spelling of 21003330031 in words is "twenty-one billion, three million, three hundred thirty thousand, thirty-one".