21011101103 has 2 divisors, whose sum is σ = 21011101104. Its totient is φ = 21011101102.

The previous prime is 21011101009. The next prime is 21011101127. The reversal of 21011101103 is 30110111012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21011101103 - 2¹⁰ = 21011100079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21017101103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505550551 + 10505550552.

It is an arithmetic number, because the mean of its divisors is an integer number (10505550552).

Almost surely, 2^21011101103 is an apocalyptic number.

21011101103 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011101103 is an equidigital number, since it uses as much as digits as its factorization.

21011101103 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 11.

Adding to 21011101103 its reverse (30110111012), we get a palindrome (51121212115).

Subtracting 21011101103 from its reverse (30110111012), we obtain a palindrome (9099009909).

The spelling of 21011101103 in words is "twenty-one billion, eleven million, one hundred one thousand, one hundred three".