21221200027 has 2 divisors, whose sum is σ = 21221200028. Its totient is φ = 21221200026.

The previous prime is 21221199973. The next prime is 21221200037. The reversal of 21221200027 is 72000212212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21221200027 - 2²³ = 21212811419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21221199977 and 21221200013.

It is not a weakly prime, because it can be changed into another prime (21221200037) 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, 10610600013 + 10610600014.

It is an arithmetic number, because the mean of its divisors is an integer number (10610600014).

Almost surely, 2^21221200027 is an apocalyptic number.

21221200027 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221200027 is an equidigital number, since it uses as much as digits as its factorization.

21221200027 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 224, while the sum is 19.

Adding to 21221200027 its reverse (72000212212), we get a palindrome (93221412239).

The spelling of 21221200027 in words is "twenty-one billion, two hundred twenty-one million, two hundred thousand, twenty-seven".