1220220100020 has 96 divisors (see below), whose sum is σ = 3469364414208. Its totient is φ = 320402460672.

The previous prime is 1220220100019. The next prime is 1220220100079. The reversal of 1220220100020 is 200010220221.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1220220099969 and 1220220100005.

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 31 ways as a sum of consecutive naturals, for example, 614409 + ... + 1678671.

It is an arithmetic number, because the mean of its divisors is an integer number (36139212648).

Almost surely, 2^{1220220100020} is an apocalyptic number.

1220220100020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1220220100020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1734682207104).

1220220100020 is an abundant number, since it is smaller than the sum of its proper divisors (2249144314188).

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

1220220100020 is a wasteful number, since it uses less digits than its factorization.

1220220100020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1064569 (or 1064567 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 1220220100020 its reverse (200010220221), we get a palindrome (1420230320241).

The spelling of 1220220100020 in words is "one trillion, two hundred twenty billion, two hundred twenty million, one hundred thousand, twenty".