1220544004520 has 32 divisors (see below), whose sum is σ = 2757714508800. Its totient is φ = 486174846528.

The previous prime is 1220544004507. The next prime is 1220544004523. The reversal of 1220544004520 is 254004450221.

It is not an unprimeable number, because it can be changed into a prime (1220544004523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63826424 + ... + 63845543.

It is an arithmetic number, because the mean of its divisors is an integer number (86178578400).

Almost surely, 2^{1220544004520} is an apocalyptic number.

1220544004520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220544004520 is an abundant number, since it is smaller than the sum of its proper divisors (1537170504280).

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

1220544004520 is a wasteful number, since it uses less digits than its factorization.

1220544004520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127672217 (or 127672213 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 29.

Adding to 1220544004520 its reverse (254004450221), we get a palindrome (1474548454741).

The spelling of 1220544004520 in words is "one trillion, two hundred twenty billion, five hundred forty-four million, four thousand, five hundred twenty".