221375180 has 48 divisors (see below), whose sum is σ = 512317344. Its totient is φ = 79833600.

The previous prime is 221375179. The next prime is 221375191. The reversal of 221375180 is 81573122.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1280 + ... + 21080.

It is an arithmetic number, because the mean of its divisors is an integer number (10673278).

Almost surely, 2^221375180 is an apocalyptic number.

221375180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221375180, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (256158672).

221375180 is an abundant number, since it is smaller than the sum of its proper divisors (290942164).

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

221375180 is a wasteful number, since it uses less digits than its factorization.

221375180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19866 (or 19864 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 221375180 is about 14878.6820652906. The cubic root of 221375180 is about 604.9362954575.

The spelling of 221375180 in words is "two hundred twenty-one million, three hundred seventy-five thousand, one hundred eighty".