221212100027 has 2 divisors, whose sum is σ = 221212100028. Its totient is φ = 221212100026.

The previous prime is 221212099907. The next prime is 221212100063. The reversal of 221212100027 is 720001212122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221212100027 - 2¹⁸ = 221211837883 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221212099981 and 221212100008.

It is not a weakly prime, because it can be changed into another prime (221212100227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110606050013 + 110606050014.

It is an arithmetic number, because the mean of its divisors is an integer number (110606050014).

Almost surely, 2^221212100027 is an apocalyptic number.

221212100027 is a deficient number, since it is larger than the sum of its proper divisors (1).

221212100027 is an equidigital number, since it uses as much as digits as its factorization.

221212100027 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 20.

Adding to 221212100027 its reverse (720001212122), we get a palindrome (941213312149).

The spelling of 221212100027 in words is "two hundred twenty-one billion, two hundred twelve million, one hundred thousand, twenty-seven".