21210111101227 has 2 divisors, whose sum is σ = 21210111101228. Its totient is φ = 21210111101226.

The previous prime is 21210111101203. The next prime is 21210111101239. The reversal of 21210111101227 is 72210111101212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21210111101227 - 2²⁷ = 21209976883499 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21210111101198 and 21210111101207.

It is not a weakly prime, because it can be changed into another prime (21210111101327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605055550613 + 10605055550614.

It is an arithmetic number, because the mean of its divisors is an integer number (10605055550614).

Almost surely, 2^{21210111101227} is an apocalyptic number.

21210111101227 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210111101227 is an equidigital number, since it uses as much as digits as its factorization.

21210111101227 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 22.

Adding to 21210111101227 its reverse (72210111101212), we get a palindrome (93420222202439).

The spelling of 21210111101227 in words is "twenty-one trillion, two hundred ten billion, one hundred eleven million, one hundred one thousand, two hundred twenty-seven".