1220221111220 has 12 divisors (see below), whose sum is σ = 2562464333604. Its totient is φ = 488088444480.

The previous prime is 1220221111159. The next prime is 1220221111271. The reversal of 1220221111220 is 221111220221.

It can be written as a sum of positive squares in 2 ways, for example, as 516437700496 + 703783410724 = 718636^2 + 838918^2 .

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 3 ways as a sum of consecutive naturals, for example, 30505527761 + ... + 30505527800.

It is an arithmetic number, because the mean of its divisors is an integer number (213538694467).

Almost surely, 2^{1220221111220} is an apocalyptic number.

1220221111220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220221111220 is an abundant number, since it is smaller than the sum of its proper divisors (1342243222384).

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

1220221111220 is a wasteful number, since it uses less digits than its factorization.

1220221111220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61011055570 (or 61011055568 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1220221111220 its reverse (221111220221), we get a palindrome (1441332331441).

The spelling of 1220221111220 in words is "one trillion, two hundred twenty billion, two hundred twenty-one million, one hundred eleven thousand, two hundred twenty".