221540480 has 64 divisors (see below), whose sum is σ = 605292480. Its totient is φ = 75955200.

The previous prime is 221540479. The next prime is 221540533. The reversal of 221540480 is 84045122.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

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, 20246 + ... + 29205.

It is an arithmetic number, because the mean of its divisors is an integer number (9457695).

Almost surely, 2^221540480 is an apocalyptic number.

221540480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221540480 is an abundant number, since it is smaller than the sum of its proper divisors (383752000).

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

221540480 is an equidigital number, since it uses as much as digits as its factorization.

221540480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49477 (or 49465 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 26.

The square root of 221540480 is about 14884.2359562055. The cubic root of 221540480 is about 605.0868258694.

The spelling of 221540480 in words is "two hundred twenty-one million, five hundred forty thousand, four hundred eighty".