1220221221220 has 12 divisors (see below), whose sum is σ = 2562464564604. Its totient is φ = 488088488480.

The previous prime is 1220221221217. The next prime is 1220221221223. The reversal of 1220221221220 is 221221220221.

It is an interprime number because it is at equal distance from previous prime (1220221221217) and next prime (1220221221223).

It can be written as a sum of positive squares in 2 ways, for example, as 887375304036 + 332845917184 = 942006^2 + 576928^2 .

It is not an unprimeable number, because it can be changed into a prime (1220221221223) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 30505530511 + ... + 30505530550.

It is an arithmetic number, because the mean of its divisors is an integer number (213538713717).

Almost surely, 2^{1220221221220} is an apocalyptic number.

1220221221220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220221221220 is an abundant number, since it is smaller than the sum of its proper divisors (1342243343384).

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

1220221221220 is a wasteful number, since it uses less digits than its factorization.

1220221221220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61011061070 (or 61011061068 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 1220221221220 its reverse (221221220221), we get a palindrome (1441442441441).

Subtracting from 1220221221220 its reverse (221221220221), we obtain a palindrome (999000000999).

It can be divided in two parts, 1220221 and 221220, that added together give a palindrome (1441441).

The spelling of 1220221221220 in words is "one trillion, two hundred twenty billion, two hundred twenty-one million, two hundred twenty-one thousand, two hundred twenty".