221555696 has 20 divisors (see below), whose sum is σ = 454515552. Its totient is φ = 104261376.

The previous prime is 221555693. The next prime is 221555707. The reversal of 221555696 is 696555122.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221555693) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 407000 + ... + 407543.

Almost surely, 2^221555696 is an apocalyptic number.

It is an amenable number.

221555696 is an abundant number, since it is smaller than the sum of its proper divisors (232959856).

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

221555696 is a wasteful number, since it uses less digits than its factorization.

221555696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 814568 (or 814562 counting only the distinct ones).

The product of its digits is 162000, while the sum is 41.

The square root of 221555696 is about 14884.7470922418. The cubic root of 221555696 is about 605.1006785528.

The spelling of 221555696 in words is "two hundred twenty-one million, five hundred fifty-five thousand, six hundred ninety-six".