21221221019027 has 2 divisors, whose sum is σ = 21221221019028. Its totient is φ = 21221221019026.

The previous prime is 21221221019017. The next prime is 21221221019041. The reversal of 21221221019027 is 72091012212212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21221221019027 - 2³⁸ = 20946343112083 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21221221018984 and 21221221019002.

It is not a weakly prime, because it can be changed into another prime (21221221019017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610610509513 + 10610610509514.

It is an arithmetic number, because the mean of its divisors is an integer number (10610610509514).

Almost surely, 2^{21221221019027} is an apocalyptic number.

21221221019027 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221221019027 is an equidigital number, since it uses as much as digits as its factorization.

21221221019027 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 32.

The spelling of 21221221019027 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred twenty-one million, nineteen thousand, twenty-seven".