21111000203 has 2 divisors, whose sum is σ = 21111000204. Its totient is φ = 21111000202.

The previous prime is 21111000193. The next prime is 21111000223. The reversal of 21111000203 is 30200011112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21111000203 - 2⁶ = 21111000139 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21111000223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555500101 + 10555500102.

It is an arithmetic number, because the mean of its divisors is an integer number (10555500102).

Almost surely, 2^21111000203 is an apocalyptic number.

21111000203 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111000203 is an equidigital number, since it uses as much as digits as its factorization.

21111000203 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 21111000203 its reverse (30200011112), we get a palindrome (51311011315).

The spelling of 21111000203 in words is "twenty-one billion, one hundred eleven million, two hundred three", and thus it is an aban number.