221745116 has 12 divisors (see below), whose sum is σ = 404926032. Its totient is φ = 106051968.

The previous prime is 221745089. The next prime is 221745133. The reversal of 221745116 is 611547122.

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, 1205045 + ... + 1205228.

It is an arithmetic number, because the mean of its divisors is an integer number (33743836).

Almost surely, 2^221745116 is an apocalyptic number.

It is an amenable number.

221745116 is a deficient number, since it is larger than the sum of its proper divisors (183180916).

221745116 is a wasteful number, since it uses less digits than its factorization.

221745116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2410300 (or 2410298 counting only the distinct ones).

The product of its digits is 3360, while the sum is 29.

The square root of 221745116 is about 14891.1086222618. The cubic root of 221745116 is about 605.2730739123.

The spelling of 221745116 in words is "two hundred twenty-one million, seven hundred forty-five thousand, one hundred sixteen".