221163940 has 12 divisors (see below), whose sum is σ = 464444316. Its totient is φ = 88465568.

The previous prime is 221163893. The next prime is 221163941. The reversal of 221163940 is 49361122.

221163940 is digitally balanced in base 2, 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 165482496 + 55681444 = 12864^2 + 7462^2 .

It is a junction number, because it is equal to n+sod(n) for n = 221163899 and 221163908.

It is not an unprimeable number, because it can be changed into a prime (221163941) 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, 5529079 + ... + 5529118.

It is an arithmetic number, because the mean of its divisors is an integer number (38703693).

Almost surely, 2^221163940 is an apocalyptic number.

221163940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221163940 is an abundant number, since it is smaller than the sum of its proper divisors (243280376).

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

221163940 is a wasteful number, since it uses less digits than its factorization.

221163940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11058206 (or 11058204 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 221163940 is about 14871.5816240237. The cubic root of 221163940 is about 604.7438206883.

The spelling of 221163940 in words is "two hundred twenty-one million, one hundred sixty-three thousand, nine hundred forty".