221265476450 has 18 divisors (see below), whose sum is σ = 411559972929. Its totient is φ = 88504860120.

The previous prime is 221265476447. The next prime is 221265476459. The reversal of 221265476450 is 54674562122.

221265476450 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 2 ways, for example, as 216840166921 + 4425309529 = 465661^2 + 66523^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=332615.

It is a super-2 number, since 2×221265476450² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221265476459) 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 8 ways as a sum of consecutive naturals, for example, 3292889 + ... + 3359411.

Almost surely, 2^221265476450 is an apocalyptic number.

221265476450 is a deficient number, since it is larger than the sum of its proper divisors (190294496479).

221265476450 is an frugal number, since it uses more digits than its factorization.

221265476450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133058 (or 66530 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 44.

The spelling of 221265476450 in words is "two hundred twenty-one billion, two hundred sixty-five million, four hundred seventy-six thousand, four hundred fifty".