21102010100111 has 2 divisors, whose sum is σ = 21102010100112. Its totient is φ = 21102010100110.

The previous prime is 21102010100081. The next prime is 21102010100123. The reversal of 21102010100111 is 11100101020112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21102010100111 - 2¹⁴ = 21102010083727 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21102010100092 and 21102010100101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21102010120111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551005050055 + 10551005050056.

It is an arithmetic number, because the mean of its divisors is an integer number (10551005050056).

Almost surely, 2^{21102010100111} is an apocalyptic number.

21102010100111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21102010100111 is an equidigital number, since it uses as much as digits as its factorization.

21102010100111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 21102010100111 its reverse (11100101020112), we get a palindrome (32202111120223).

The spelling of 21102010100111 in words is "twenty-one trillion, one hundred two billion, ten million, one hundred thousand, one hundred eleven".