1220111222020 has 24 divisors (see below), whose sum is σ = 2566554389784. Its totient is φ = 487221474816.

The previous prime is 1220111222017. The next prime is 1220111222041. The reversal of 1220111222020 is 202221110221.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 132082818624 + 1088028403396 = 363432^2 + 1043086^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1220111221985 and 1220111222003.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51426219 + ... + 51449938.

It is an arithmetic number, because the mean of its divisors is an integer number (106939766241).

Almost surely, 2^{1220111222020} is an apocalyptic number.

1220111222020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220111222020 is an abundant number, since it is smaller than the sum of its proper divisors (1346443167764).

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

1220111222020 is a wasteful number, since it uses less digits than its factorization.

1220111222020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102876759 (or 102876757 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1220111222020 its reverse (202221110221), we get a palindrome (1422332332241).

The spelling of 1220111222020 in words is "one trillion, two hundred twenty billion, one hundred eleven million, two hundred twenty-two thousand, twenty".