221986860 has 24 divisors (see below), whose sum is σ = 621563376. Its totient is φ = 59196480.

The previous prime is 221986819. The next prime is 221986871. The reversal of 221986860 is 68689122.

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, 1849831 + ... + 1849950.

It is an arithmetic number, because the mean of its divisors is an integer number (25898474).

Almost surely, 2^221986860 is an apocalyptic number.

221986860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221986860 is an abundant number, since it is smaller than the sum of its proper divisors (399576516).

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

221986860 is a wasteful number, since it uses less digits than its factorization.

221986860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3699793 (or 3699791 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 221986860 is about 14899.2234696980. The cubic root of 221986860 is about 605.4929479675.

The spelling of 221986860 in words is "two hundred twenty-one million, nine hundred eighty-six thousand, eight hundred sixty".