221221200427 has 2 divisors, whose sum is σ = 221221200428. Its totient is φ = 221221200426.

The previous prime is 221221200401. The next prime is 221221200509. The reversal of 221221200427 is 724002122122.

It is a happy number.

221221200427 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221221200427 - 2²³ = 221212811819 is a prime.

It is not a weakly prime, because it can be changed into another prime (221221230427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110610600213 + 110610600214.

It is an arithmetic number, because the mean of its divisors is an integer number (110610600214).

Almost surely, 2^221221200427 is an apocalyptic number.

221221200427 is a deficient number, since it is larger than the sum of its proper divisors (1).

221221200427 is an equidigital number, since it uses as much as digits as its factorization.

221221200427 is an odious number, because the sum of its binary digits is odd.

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

Adding to 221221200427 its reverse (724002122122), we get a palindrome (945223322549).

The spelling of 221221200427 in words is "two hundred twenty-one billion, two hundred twenty-one million, two hundred thousand, four hundred twenty-seven".