221703240 has 128 divisors (see below), whose sum is σ = 739497600. Its totient is φ = 52715520.

The previous prime is 221703199. The next prime is 221703247. The reversal of 221703240 is 42307122.

221703240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (221703247) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 68376 + ... + 71544.

It is an arithmetic number, because the mean of its divisors is an integer number (5777325).

Almost surely, 2^221703240 is an apocalyptic number.

221703240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221703240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (369748800).

221703240 is an abundant number, since it is smaller than the sum of its proper divisors (517794360).

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

221703240 is a wasteful number, since it uses less digits than its factorization.

221703240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3247 (or 3243 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 221703240 is about 14889.7024819168. The cubic root of 221703240 is about 605.2349700878.

The spelling of 221703240 in words is "two hundred twenty-one million, seven hundred three thousand, two hundred forty".