221509244 has 12 divisors (see below), whose sum is σ = 422881368. Its totient is φ = 100686000.

The previous prime is 221509231. The next prime is 221509283. The reversal of 221509244 is 442905122.

221509244 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2517107 + ... + 2517194.

It is an arithmetic number, because the mean of its divisors is an integer number (35240114).

Almost surely, 2^221509244 is an apocalyptic number.

It is an amenable number.

221509244 is a deficient number, since it is larger than the sum of its proper divisors (201372124).

221509244 is a wasteful number, since it uses less digits than its factorization.

221509244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5034316 (or 5034314 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 221509244 is about 14883.1866211507. The cubic root of 221509244 is about 605.0583865515.

The spelling of 221509244 in words is "two hundred twenty-one million, five hundred nine thousand, two hundred forty-four".