221110656 has 64 divisors (see below), whose sum is σ = 632518320. Its totient is φ = 68032512.

The previous prime is 221110639. The next prime is 221110697. The reversal of 221110656 is 656011122.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent 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, 17155 + ... + 27138.

Almost surely, 2^221110656 is an apocalyptic number.

221110656 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

221110656 is an abundant number, since it is smaller than the sum of its proper divisors (411407664).

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

221110656 is a wasteful number, since it uses less digits than its factorization.

221110656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44323 (or 44311 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 221110656 is about 14869.7900455924. The cubic root of 221110656 is about 604.6952507483.

Adding to 221110656 its reverse (656011122), we get a palindrome (877121778).

The spelling of 221110656 in words is "two hundred twenty-one million, one hundred ten thousand, six hundred fifty-six".