221466660 has 48 divisors (see below), whose sum is σ = 652747200. Its totient is φ = 55949184.

The previous prime is 221466653. The next prime is 221466671. The reversal of 221466660 is 66664122.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95995 + ... + 98274.

It is an arithmetic number, because the mean of its divisors is an integer number (13598900).

Almost surely, 2^221466660 is an apocalyptic number.

221466660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221466660 is an abundant number, since it is smaller than the sum of its proper divisors (431280540).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221466660 is a wasteful number, since it uses less digits than its factorization.

221466660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194300 (or 194298 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 221466660 is about 14881.7559447802. The cubic root of 221466660 is about 605.0196109573.

The spelling of 221466660 in words is "two hundred twenty-one million, four hundred sixty-six thousand, six hundred sixty".