221939360 has 24 divisors (see below), whose sum is σ = 524332116. Its totient is φ = 88775680.

The previous prime is 221939359. The next prime is 221939363. The reversal of 221939360 is 63939122.

221939360 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 218684944 + 3254416 = 14788^2 + 1804^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 221939360.

It is not an unprimeable number, because it can be changed into a prime (221939363) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 693401 + ... + 693720.

Almost surely, 2^221939360 is an apocalyptic number.

221939360 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221939360 is an abundant number, since it is smaller than the sum of its proper divisors (302392756).

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

221939360 is a wasteful number, since it uses less digits than its factorization.

221939360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1387136 (or 1387128 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 35.

The square root of 221939360 is about 14897.6293416100. The cubic root of 221939360 is about 605.4497577735.

The spelling of 221939360 in words is "two hundred twenty-one million, nine hundred thirty-nine thousand, three hundred sixty".