221221202227 has 2 divisors, whose sum is σ = 221221202228. Its totient is φ = 221221202226.

The previous prime is 221221202149. The next prime is 221221202261. The reversal of 221221202227 is 722202122122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221221202227 - 2¹⁹ = 221220677939 is a prime.

It is not a weakly prime, because it can be changed into another prime (221221203227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110610601113 + 110610601114.

It is an arithmetic number, because the mean of its divisors is an integer number (110610601114).

Almost surely, 2^221221202227 is an apocalyptic number.

221221202227 is a deficient number, since it is larger than the sum of its proper divisors (1).

221221202227 is an equidigital number, since it uses as much as digits as its factorization.

221221202227 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1792, while the sum is 25.

Adding to 221221202227 its reverse (722202122122), we get a palindrome (943423324349).

The spelling of 221221202227 in words is "two hundred twenty-one billion, two hundred twenty-one million, two hundred two thousand, two hundred twenty-seven".