21102010211111 has 2 divisors, whose sum is σ = 21102010211112. Its totient is φ = 21102010211110.

The previous prime is 21102010211081. The next prime is 21102010211119. The reversal of 21102010211111 is 11111201020112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21102010211111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21102010211119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551005105555 + 10551005105556.

It is an arithmetic number, because the mean of its divisors is an integer number (10551005105556).

Almost surely, 2^{21102010211111} is an apocalyptic number.

21102010211111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21102010211111 is an equidigital number, since it uses as much as digits as its factorization.

21102010211111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 21102010211111 its reverse (11111201020112), we get a palindrome (32213211231223).

The spelling of 21102010211111 in words is "twenty-one trillion, one hundred two billion, ten million, two hundred eleven thousand, one hundred eleven".