221040142506 has 24 divisors (see below), whose sum is σ = 478931175684. Its totient is φ = 73678375680.

The previous prime is 221040142493. The next prime is 221040142507. The reversal of 221040142506 is 605241040122.

221040142506 is a `hidden beast` number, since 2 + 2 + 1 + 0 + 401 + 4 + 250 + 6 = 666.

221040142506 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 218471173281 + 2568969225 = 467409^2 + 50685^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 221040142506.

It is not an unprimeable number, because it can be changed into a prime (221040142507) 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 11 ways as a sum of consecutive naturals, for example, 875980 + ... + 1099736.

Almost surely, 2^221040142506 is an apocalyptic number.

221040142506 is an abundant number, since it is smaller than the sum of its proper divisors (257891033178).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221040142506 is a wasteful number, since it uses less digits than its factorization.

221040142506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278646 (or 278643 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

Adding to 221040142506 its reverse (605241040122), we get a palindrome (826281182628).

The spelling of 221040142506 in words is "two hundred twenty-one billion, forty million, one hundred forty-two thousand, five hundred six".