221244015 has 16 divisors (see below), whose sum is σ = 369381888. Its totient is φ = 112866336.

The previous prime is 221243963. The next prime is 221244017. The reversal of 221244015 is 510442122.

It is not a de Polignac number, because 221244015 - 2¹⁰ = 221242991 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221243982 and 221244000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221244017) 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 15 ways as a sum of consecutive naturals, for example, 320299 + ... + 320988.

It is an arithmetic number, because the mean of its divisors is an integer number (23086368).

Almost surely, 2^221244015 is an apocalyptic number.

221244015 is a deficient number, since it is larger than the sum of its proper divisors (148137873).

221244015 is a wasteful number, since it uses less digits than its factorization.

221244015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641318.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 221244015 is about 14874.2735957088. The cubic root of 221244015 is about 604.8167967475.

Adding to 221244015 its reverse (510442122), we get a palindrome (731686137).

The spelling of 221244015 in words is "two hundred twenty-one million, two hundred forty-four thousand, fifteen".