1220012100220 has 72 divisors (see below), whose sum is σ = 2771680249296. Its totient is φ = 449526084096.

The previous prime is 1220012100199. The next prime is 1220012100253. The reversal of 1220012100220 is 220012100221.

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 1220012100220.

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, 61134 + ... + 1563253.

It is an arithmetic number, because the mean of its divisors is an integer number (38495559018).

Almost surely, 2^{1220012100220} is an apocalyptic number.

1220012100220 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 1220012100220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1385840124648).

1220012100220 is an abundant number, since it is smaller than the sum of its proper divisors (1551668149076).

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

1220012100220 is a wasteful number, since it uses less digits than its factorization.

1220012100220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1624507 (or 1624458 counting only the distinct ones).

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

Adding to 1220012100220 its reverse (220012100221), we get a palindrome (1440024200441).

Subtracting from 1220012100220 its reverse (220012100221), we obtain a palindrome (999999999999).

The spelling of 1220012100220 in words is "one trillion, two hundred twenty billion, twelve million, one hundred thousand, two hundred twenty".