21212122027 has 2 divisors, whose sum is σ = 21212122028. Its totient is φ = 21212122026.

The previous prime is 21212121971. The next prime is 21212122039. The reversal of 21212122027 is 72022121212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21212122027 - 2⁷ = 21212121899 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21212121989 and 21212122007.

It is not a weakly prime, because it can be changed into another prime (21212122067) 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, 10606061013 + 10606061014.

It is an arithmetic number, because the mean of its divisors is an integer number (10606061014).

Almost surely, 2^21212122027 is an apocalyptic number.

21212122027 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212122027 is an equidigital number, since it uses as much as digits as its factorization.

21212122027 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 21212122027 its reverse (72022121212), we get a palindrome (93234243239).

The spelling of 21212122027 in words is "twenty-one billion, two hundred twelve million, one hundred twenty-two thousand, twenty-seven".