421221225055573 has 2 divisors, whose sum is σ = 421221225055574. Its totient is φ = 421221225055572.

The previous prime is 421221225055567. The next prime is 421221225055601. The reversal of 421221225055573 is 375550522122124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 381485625165649 + 39735599889924 = 19531657^2 + 6303618^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421221225055573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421221226055573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210610612527786 + 210610612527787.

It is an arithmetic number, because the mean of its divisors is an integer number (210610612527787).

Almost surely, 2^{421221225055573} is an apocalyptic number.

It is an amenable number.

421221225055573 is a deficient number, since it is larger than the sum of its proper divisors (1).

421221225055573 is an equidigital number, since it uses as much as digits as its factorization.

421221225055573 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1680000, while the sum is 46.

Adding to 421221225055573 its reverse (375550522122124), we get a palindrome (796771747177697).

The spelling of 421221225055573 in words is "four hundred twenty-one trillion, two hundred twenty-one billion, two hundred twenty-five million, fifty-five thousand, five hundred seventy-three".