221620050529 has 2 divisors, whose sum is σ = 221620050530. Its totient is φ = 221620050528.

The previous prime is 221620050527. The next prime is 221620050607. The reversal of 221620050529 is 925050026122.

221620050529 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 can be written as a sum of positive squares in only one way, i.e., 180115360000 + 41504690529 = 424400^2 + 203727^2 .

It is a cyclic number.

It is not a de Polignac number, because 221620050529 - 2¹ = 221620050527 is a prime.

Together with 221620050527, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 221620050494 and 221620050503.

It is not a weakly prime, because it can be changed into another prime (221620050527) 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, 110810025264 + 110810025265.

It is an arithmetic number, because the mean of its divisors is an integer number (110810025265).

Almost surely, 2^221620050529 is an apocalyptic number.

It is an amenable number.

221620050529 is a deficient number, since it is larger than the sum of its proper divisors (1).

221620050529 is an equidigital number, since it uses as much as digits as its factorization.

221620050529 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21600, while the sum is 34.

The spelling of 221620050529 in words is "two hundred twenty-one billion, six hundred twenty million, fifty thousand, five hundred twenty-nine".