221544240345 has 32 divisors (see below), whose sum is σ = 398601705600. Its totient is φ = 116733344832.

The previous prime is 221544240343. The next prime is 221544240353. The reversal of 221544240345 is 543042445122.

221544240345 is a `hidden beast` number, since 2 + 21 + 54 + 4 + 240 + 345 = 666.

It is not a de Polignac number, because 221544240345 - 2¹ = 221544240343 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221544240341) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9874750 + ... + 9897159.

It is an arithmetic number, because the mean of its divisors is an integer number (12456303300).

Almost surely, 2^221544240345 is an apocalyptic number.

It is an amenable number.

221544240345 is a deficient number, since it is larger than the sum of its proper divisors (177057465255).

221544240345 is a wasteful number, since it uses less digits than its factorization.

221544240345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19772006 (or 19772000 counting only the distinct ones).

The product of its (nonzero) digits is 153600, while the sum is 36.

Adding to 221544240345 its reverse (543042445122), we get a palindrome (764586685467).

The spelling of 221544240345 in words is "two hundred twenty-one billion, five hundred forty-four million, two hundred forty thousand, three hundred forty-five".