21030002111 has 2 divisors, whose sum is σ = 21030002112. Its totient is φ = 21030002110.

The previous prime is 21030002107. The next prime is 21030002141. The reversal of 21030002111 is 11120003012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21030002111 - 2² = 21030002107 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21030002092 and 21030002101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21030002101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10515001055 + 10515001056.

It is an arithmetic number, because the mean of its divisors is an integer number (10515001056).

Almost surely, 2^21030002111 is an apocalyptic number.

21030002111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21030002111 is an equidigital number, since it uses as much as digits as its factorization.

21030002111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 21030002111 its reverse (11120003012), we get a palindrome (32150005123).

Subtracting from 21030002111 its reverse (11120003012), we obtain a palindrome (9909999099).

The spelling of 21030002111 in words is "twenty-one billion, thirty million, two thousand, one hundred eleven".