21111311227 has 2 divisors, whose sum is σ = 21111311228. Its totient is φ = 21111311226.

The previous prime is 21111311213. The next prime is 21111311239. The reversal of 21111311227 is 72211311112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21111311227 - 2²³ = 21102922619 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21111311198 and 21111311207.

It is not a weakly prime, because it can be changed into another prime (21111311257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555655613 + 10555655614.

It is an arithmetic number, because the mean of its divisors is an integer number (10555655614).

Almost surely, 2^21111311227 is an apocalyptic number.

21111311227 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111311227 is an equidigital number, since it uses as much as digits as its factorization.

21111311227 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 168, while the sum is 22.

Adding to 21111311227 its reverse (72211311112), we get a palindrome (93322622339).

The spelling of 21111311227 in words is "twenty-one billion, one hundred eleven million, three hundred eleven thousand, two hundred twenty-seven".