221155460 has 12 divisors (see below), whose sum is σ = 464426508. Its totient is φ = 88462176.

The previous prime is 221155453. The next prime is 221155481. The reversal of 221155460 is 64551122.

It can be written as a sum of positive squares in 2 ways, for example, as 42719296 + 178436164 = 6536^2 + 13358^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5528867 + ... + 5528906.

It is an arithmetic number, because the mean of its divisors is an integer number (38702209).

Almost surely, 2^221155460 is an apocalyptic number.

221155460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221155460 is an abundant number, since it is smaller than the sum of its proper divisors (243271048).

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

221155460 is a wasteful number, since it uses less digits than its factorization.

221155460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11057782 (or 11057780 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 221155460 is about 14871.2965137543. The cubic root of 221155460 is about 604.7360914398.

The spelling of 221155460 in words is "two hundred twenty-one million, one hundred fifty-five thousand, four hundred sixty".