1220111120020 has 48 divisors (see below), whose sum is σ = 2783747126160. Its totient is φ = 446515808256.

The previous prime is 1220111119993. The next prime is 1220111120051. The reversal of 1220111120020 is 200211110221.

It can be written as a sum of positive squares in 8 ways, for example, as 91272868996 + 1128838251024 = 302114^2 + 1062468^2 .

It is a super-2 number, since 2×1220111120020² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a congruent number.

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, 20734935 + ... + 20793694.

It is an arithmetic number, because the mean of its divisors is an integer number (57994731795).

Almost surely, 2^{1220111120020} is an apocalyptic number.

1220111120020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220111120020 is an abundant number, since it is smaller than the sum of its proper divisors (1563636006140).

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

1220111120020 is a wasteful number, since it uses less digits than its factorization.

1220111120020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41528764 (or 41528762 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1220111120020 its reverse (200211110221), we get a palindrome (1420322230241).

The spelling of 1220111120020 in words is "one trillion, two hundred twenty billion, one hundred eleven million, one hundred twenty thousand, twenty".