221481880 has 32 divisors (see below), whose sum is σ = 498758400. Its totient is φ = 88517376.

The previous prime is 221481853. The next prime is 221481893. The reversal of 221481880 is 88184122.

221481880 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 88324 + ... + 90796.

It is an arithmetic number, because the mean of its divisors is an integer number (15586200).

Almost surely, 2^221481880 is an apocalyptic number.

221481880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221481880 is an abundant number, since it is smaller than the sum of its proper divisors (277276520).

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

221481880 is a wasteful number, since it uses less digits than its factorization.

221481880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4723 (or 4719 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 34.

The square root of 221481880 is about 14882.2673003814. The cubic root of 221481880 is about 605.0334703610.

The spelling of 221481880 in words is "two hundred twenty-one million, four hundred eighty-one thousand, eight hundred eighty".