221623621445 has 8 divisors (see below), whose sum is σ = 266074221336. Its totient is φ = 177214980096.

The previous prime is 221623621441. The next prime is 221623621469. The reversal of 221623621445 is 544126326122.

221623621445 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 19410619684 + 202213001761 = 139322^2 + 449681^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221623621445 - 2² = 221623621441 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 221623621399 and 221623621408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221623621441) 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 in 7 ways as a sum of consecutive naturals, for example, 10478012 + ... + 10499141.

It is an arithmetic number, because the mean of its divisors is an integer number (33259277667).

Almost surely, 2^221623621445 is an apocalyptic number.

It is an amenable number.

221623621445 is a deficient number, since it is larger than the sum of its proper divisors (44450599891).

221623621445 is a wasteful number, since it uses less digits than its factorization.

221623621445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20979271.

The product of its digits is 138240, while the sum is 38.

Adding to 221623621445 its reverse (544126326122), we get a palindrome (765749947567).

The spelling of 221623621445 in words is "two hundred twenty-one billion, six hundred twenty-three million, six hundred twenty-one thousand, four hundred forty-five".