221120520 has 64 divisors (see below), whose sum is σ = 684771840. Its totient is φ = 57062400.

The previous prime is 221120519. The next prime is 221120531. The reversal of 221120520 is 25021122.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 221120520.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26001 + ... + 33440.

It is an arithmetic number, because the mean of its divisors is an integer number (10699560).

Almost surely, 2^221120520 is an apocalyptic number.

221120520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221120520 is an abundant number, since it is smaller than the sum of its proper divisors (463651320).

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

221120520 is a wasteful number, since it uses less digits than its factorization.

221120520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59486 (or 59482 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 221120520 is about 14870.1217210889. The cubic root of 221120520 is about 604.7042426642.

Adding to 221120520 its reverse (25021122), we get a palindrome (246141642).

The spelling of 221120520 in words is "two hundred twenty-one million, one hundred twenty thousand, five hundred twenty".