221088860 has 24 divisors (see below), whose sum is σ = 464864400. Its totient is φ = 88325504.

The previous prime is 221088853. The next prime is 221088887. The reversal of 221088860 is 68880122.

221088860 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 221088860.

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, 10691 + ... + 23589.

It is an arithmetic number, because the mean of its divisors is an integer number (19369350).

Almost surely, 2^221088860 is an apocalyptic number.

221088860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221088860 is an abundant number, since it is smaller than the sum of its proper divisors (243775540).

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

221088860 is a wasteful number, since it uses less digits than its factorization.

221088860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13765 (or 13763 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 35.

The square root of 221088860 is about 14869.0571321789. The cubic root of 221088860 is about 604.6753808017.

The spelling of 221088860 in words is "two hundred twenty-one million, eighty-eight thousand, eight hundred sixty".