21122012227 has 2 divisors, whose sum is σ = 21122012228. Its totient is φ = 21122012226.

The previous prime is 21122012183. The next prime is 21122012243. The reversal of 21122012227 is 72221022112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21122012227 is a prime.

It is a super-2 number, since 2×21122012227² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21122012198 and 21122012207.

It is not a weakly prime, because it can be changed into another prime (21122012827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561006113 + 10561006114.

It is an arithmetic number, because the mean of its divisors is an integer number (10561006114).

Almost surely, 2^21122012227 is an apocalyptic number.

21122012227 is a deficient number, since it is larger than the sum of its proper divisors (1).

21122012227 is an equidigital number, since it uses as much as digits as its factorization.

21122012227 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 448, while the sum is 22.

Adding to 21122012227 its reverse (72221022112), we get a palindrome (93343034339).

The spelling of 21122012227 in words is "twenty-one billion, one hundred twenty-two million, twelve thousand, two hundred twenty-seven".