21010111103 has 2 divisors, whose sum is σ = 21010111104. Its totient is φ = 21010111102.

The previous prime is 21010111091. The next prime is 21010111163. The reversal of 21010111103 is 30111101012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21010111103 - 2¹² = 21010107007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21010111163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505055551 + 10505055552.

It is an arithmetic number, because the mean of its divisors is an integer number (10505055552).

Almost surely, 2^21010111103 is an apocalyptic number.

21010111103 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010111103 is an equidigital number, since it uses as much as digits as its factorization.

21010111103 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 21010111103 its reverse (30111101012), we get a palindrome (51121212115).

The spelling of 21010111103 in words is "twenty-one billion, ten million, one hundred eleven thousand, one hundred three".