221907240 has 48 divisors (see below), whose sum is σ = 721199700. Its totient is φ = 59175168.

The previous prime is 221907199. The next prime is 221907271. The reversal of 221907240 is 42709122.

It can be written as a sum of positive squares in 2 ways, for example, as 220879044 + 1028196 = 14862^2 + 1014^2 .

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 11 ways as a sum of consecutive naturals, for example, 307845 + ... + 308564.

Almost surely, 2^221907240 is an apocalyptic number.

221907240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221907240 is an abundant number, since it is smaller than the sum of its proper divisors (499292460).

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

221907240 is a wasteful number, since it uses less digits than its factorization.

221907240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616426 (or 616419 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 221907240 is about 14896.5512787356. The cubic root of 221907240 is about 605.4205486170.

The spelling of 221907240 in words is "two hundred twenty-one million, nine hundred seven thousand, two hundred forty".