21030003101 has 2 divisors, whose sum is σ = 21030003102. Its totient is φ = 21030003100.

The previous prime is 21030003097. The next prime is 21030003133. The reversal of 21030003101 is 10130003012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15120391225 + 5909611876 = 122965^2 + 76874^2 .

It is a cyclic number.

It is not a de Polignac number, because 21030003101 - 2² = 21030003097 is a prime.

It is a super-2 number, since 2×21030003101² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21030003161) 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 as a sum of consecutive naturals, namely, 10515001550 + 10515001551.

It is an arithmetic number, because the mean of its divisors is an integer number (10515001551).

Almost surely, 2^21030003101 is an apocalyptic number.

It is an amenable number.

21030003101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21030003101 is an equidigital number, since it uses as much as digits as its factorization.

21030003101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18, while the sum is 11.

Adding to 21030003101 its reverse (10130003012), we get a palindrome (31160006113).

The spelling of 21030003101 in words is "twenty-one billion, thirty million, three thousand, one hundred one".