221541242445 has 48 divisors (see below), whose sum is σ = 386710896000. Its totient is φ = 117325272960.

The previous prime is 221541242443. The next prime is 221541242453. The reversal of 221541242445 is 544242145122.

221541242445 is a `hidden beast` number, since 2 + 215 + 4 + 12 + 424 + 4 + 5 = 666.

221541242445 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221541242445 - 2¹ = 221541242443 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221541242443) 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 47 ways as a sum of consecutive naturals, for example, 4141731 + ... + 4194879.

It is an arithmetic number, because the mean of its divisors is an integer number (8056477000).

Almost surely, 2^221541242445 is an apocalyptic number.

It is an amenable number.

221541242445 is a deficient number, since it is larger than the sum of its proper divisors (165169653555).

221541242445 is a wasteful number, since it uses less digits than its factorization.

221541242445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53810 (or 53807 counting only the distinct ones).

The product of its digits is 102400, while the sum is 36.

Adding to 221541242445 its reverse (544242145122), we get a palindrome (765783387567).

The spelling of 221541242445 in words is "two hundred twenty-one billion, five hundred forty-one million, two hundred forty-two thousand, four hundred forty-five".