1220221120 has 56 divisors (see below), whose sum is σ = 2960516304. Its totient is φ = 478872576.

The previous prime is 1220221111. The next prime is 1220221127. The reversal of 1220221120 is 211220221.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1220221120.

It is not an unprimeable number, because it can be changed into a prime (1220221127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19014 + ... + 52933.

Almost surely, 2^1220221120 is an apocalyptic number.

1220221120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220221120 is an abundant number, since it is smaller than the sum of its proper divisors (1740295184).

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

1220221120 is an equidigital number, since it uses as much as digits as its factorization.

1220221120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72017 (or 72007 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 1220221120 is about 34931.6635733256. The cubic root of 1220221120 is about 1068.5942817939.

Adding to 1220221120 its reverse (211220221), we get a palindrome (1431441341).

The spelling of 1220221120 in words is "one billion, two hundred twenty million, two hundred twenty-one thousand, one hundred twenty".