221203120 has 20 divisors (see below), whose sum is σ = 514297440. Its totient is φ = 88481216.

The previous prime is 221203117. The next prime is 221203123. The reversal of 221203120 is 21302122.

221203120 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (221203117) and next prime (221203123).

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 221203120.

It is not an unprimeable number, because it can be changed into a prime (221203123) 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, 1382440 + ... + 1382599.

It is an arithmetic number, because the mean of its divisors is an integer number (25714872).

Almost surely, 2^221203120 is an apocalyptic number.

221203120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221203120 is an abundant number, since it is smaller than the sum of its proper divisors (293094320).

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

221203120 is a wasteful number, since it uses less digits than its factorization.

221203120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2765052 (or 2765046 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 221203120 is about 14872.8988431980. The cubic root of 221203120 is about 604.7795294388.

Adding to 221203120 its reverse (21302122), we get a palindrome (242505242).

The spelling of 221203120 in words is "two hundred twenty-one million, two hundred three thousand, one hundred twenty".