221500012 has 6 divisors (see below), whose sum is σ = 387625028. Its totient is φ = 110750004.

The previous prime is 221499989. The next prime is 221500039. The reversal of 221500012 is 210005122.

It is a junction number, because it is equal to n+sod(n) for n = 221499965 and 221500001.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27687498 + ... + 27687505.

Almost surely, 2^221500012 is an apocalyptic number.

It is an amenable number.

221500012 is a deficient number, since it is larger than the sum of its proper divisors (166125016).

221500012 is a wasteful number, since it uses less digits than its factorization.

221500012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55375007 (or 55375005 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 221500012 is about 14882.8764692851. The cubic root of 221500012 is about 605.0499806169.

Adding to 221500012 its reverse (210005122), we get a palindrome (431505134).

The spelling of 221500012 in words is "two hundred twenty-one million, five hundred thousand, twelve".