21121100227 has 2 divisors, whose sum is σ = 21121100228. Its totient is φ = 21121100226.

The previous prime is 21121100173. The next prime is 21121100243. The reversal of 21121100227 is 72200112112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21121100227 - 2¹¹ = 21121098179 is a prime.

It is a super-2 number, since 2×21121100227² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21121100527) 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, 10560550113 + 10560550114.

It is an arithmetic number, because the mean of its divisors is an integer number (10560550114).

Almost surely, 2^21121100227 is an apocalyptic number.

21121100227 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121100227 is an equidigital number, since it uses as much as digits as its factorization.

21121100227 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 19.

Adding to 21121100227 its reverse (72200112112), we get a palindrome (93321212339).

The spelling of 21121100227 in words is "twenty-one billion, one hundred twenty-one million, one hundred thousand, two hundred twenty-seven".