21120221027 has 2 divisors, whose sum is σ = 21120221028. Its totient is φ = 21120221026.

The previous prime is 21120221011. The next prime is 21120221041. The reversal of 21120221027 is 72012202112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21120221027 - 2⁴ = 21120221011 is a prime.

It is not a weakly prime, because it can be changed into another prime (21120221047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560110513 + 10560110514.

It is an arithmetic number, because the mean of its divisors is an integer number (10560110514).

Almost surely, 2^21120221027 is an apocalyptic number.

21120221027 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120221027 is an equidigital number, since it uses as much as digits as its factorization.

21120221027 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 20.

Adding to 21120221027 its reverse (72012202112), we get a palindrome (93132423139).

The spelling of 21120221027 in words is "twenty-one billion, one hundred twenty million, two hundred twenty-one thousand, twenty-seven".