1220321322240 has 144 divisors (see below), whose sum is σ = 3908970356928. Its totient is φ = 324453040128.

The previous prime is 1220321322223. The next prime is 1220321322251. The reversal of 1220321322240 is 422231230221.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1220321322240.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 822579 + ... + 1765581.

Almost surely, 2^{1220321322240} is an apocalyptic number.

1220321322240 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 1220321322240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1954485178464).

1220321322240 is an abundant number, since it is smaller than the sum of its proper divisors (2688649034688).

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

1220321322240 is an equidigital number, since it uses as much as digits as its factorization.

1220321322240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 943364 (or 943350 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 1220321322240 its reverse (422231230221), we get a palindrome (1642552552461).

The spelling of 1220321322240 in words is "one trillion, two hundred twenty billion, three hundred twenty-one million, three hundred twenty-two thousand, two hundred forty".