221442001506 has 72 divisors (see below), whose sum is σ = 536019372252. Its totient is φ = 66003537600.

The previous prime is 221442001493. The next prime is 221442001541. The reversal of 221442001506 is 605100244122.

221442001506 is a `hidden beast` number, since 221 + 4 + 420 + 0 + 15 + 0 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 220297870881 + 1144130625 = 469359^2 + 33825^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 221442001506.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 700521 + ... + 966236.

Almost surely, 2^221442001506 is an apocalyptic number.

221442001506 is an abundant number, since it is smaller than the sum of its proper divisors (314577370746).

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

221442001506 is a wasteful number, since it uses less digits than its factorization.

221442001506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1666848 (or 1666834 counting only the distinct ones).

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

Adding to 221442001506 its reverse (605100244122), we get a palindrome (826542245628).

The spelling of 221442001506 in words is "two hundred twenty-one billion, four hundred forty-two million, one thousand, five hundred six".