221056656 has 40 divisors (see below), whose sum is σ = 571838400. Its totient is φ = 73585536.

The previous prime is 221056637. The next prime is 221056673. The reversal of 221056656 is 656650122.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38245 + ... + 43643.

It is an arithmetic number, because the mean of its divisors is an integer number (14295960).

Almost surely, 2^221056656 is an apocalyptic number.

It is an amenable number.

221056656 is an abundant number, since it is smaller than the sum of its proper divisors (350781744).

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

221056656 is a wasteful number, since it uses less digits than its factorization.

221056656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6263 (or 6257 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 221056656 is about 14867.9741726975. The cubic root of 221056656 is about 604.6460201915.

The spelling of 221056656 in words is "two hundred twenty-one million, fifty-six thousand, six hundred fifty-six".