21103311121111 has 2 divisors, whose sum is σ = 21103311121112. Its totient is φ = 21103311121110.

The previous prime is 21103311121051. The next prime is 21103311121121. The reversal of 21103311121111 is 11112111330112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21103311121111 - 2²³ = 21103302732503 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21103311121121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551655560555 + 10551655560556.

It is an arithmetic number, because the mean of its divisors is an integer number (10551655560556).

Almost surely, 2^{21103311121111} is an apocalyptic number.

21103311121111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21103311121111 is an equidigital number, since it uses as much as digits as its factorization.

21103311121111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 19.

Adding to 21103311121111 its reverse (11112111330112), we get a palindrome (32215422451223).

The spelling of 21103311121111 in words is "twenty-one trillion, one hundred three billion, three hundred eleven million, one hundred twenty-one thousand, one hundred eleven".