221065550 has 24 divisors (see below), whose sum is σ = 425363400. Its totient is φ = 85376480.

The previous prime is 221065541. The next prime is 221065567. The reversal of 221065550 is 55560122.

221065550 is digitally balanced in base 2, 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 11 ways as a sum of consecutive naturals, for example, 74780 + ... + 77679.

It is an arithmetic number, because the mean of its divisors is an integer number (17723475).

Almost surely, 2^221065550 is an apocalyptic number.

221065550 is a deficient number, since it is larger than the sum of its proper divisors (204297850).

221065550 is a wasteful number, since it uses less digits than its factorization.

221065550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152500 (or 152495 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 221065550 is about 14868.2732689442. The cubic root of 221065550 is about 604.6541291980.

The spelling of 221065550 in words is "two hundred twenty-one million, sixty-five thousand, five hundred fifty".