1220311103220 has 72 divisors (see below), whose sum is σ = 4038120384480. Its totient is φ = 295832994240.

The previous prime is 1220311103159. The next prime is 1220311103237. The reversal of 1220311103220 is 223011130221.

1220311103220 is a `hidden beast` number, since 1 + 2 + 20 + 311 + 10 + 322 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1220311103193 and 1220311103202.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 308157390 + ... + 308161349.

It is an arithmetic number, because the mean of its divisors is an integer number (56085005340).

Almost surely, 2^{1220311103220} is an apocalyptic number.

1220311103220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220311103220 is an abundant number, since it is smaller than the sum of its proper divisors (2817809281260).

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

1220311103220 is a wasteful number, since it uses less digits than its factorization.

1220311103220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616318765 (or 616318760 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 1220311103220 its reverse (223011130221), we get a palindrome (1443322233441).

The spelling of 1220311103220 in words is "one trillion, two hundred twenty billion, three hundred eleven million, one hundred three thousand, two hundred twenty".